Agreed, ultimately it is about what camera works best for a particular person. The large majority of amateurs are buying cameras for all their shooting, the idea of more than 1 body is a luxury they're not going to indulge in. Getting the camera that can handle all one's needs really should be the goal of someone just getting into photography. Especially if they have to ask the question "what camera should I get?"
I gotta disagree with you on some points though. Particularly "mis-allocation"

. The 7D makes itself a good landscape camera simply for the weather sealing. A MASSIVELY important issue in landscape photography. Mine has been in pouring rain and blizzards. It has better sealing than the 5D does I believe... not positive on that. It's also far more customizable than the 5D or the Rebels, XXD series cameras etc. Plus it has a much more rugged build that can be relied upon than the Rebels/XXD series cameras which is also important when shooting landscape. Yeah, I take care of my gear but it's nice to know my gear can take care of itself.
I disagree with you about the need for AF in Landscape. The 7D, and the Rebels, XXD do not come with good focus screens for manual. If you're as blind as I am and have difficulty jamming your glasses wearing face into the viewfinder, especially when trying to get real low to the ground, having an autofocus you can trust is priceless. On my recent trip to Yellowstone the AF on my 24-70 went wonky and I had to shoot manual. Because of the above situation I have a couple of shots that are softer than they should be. In the bright sun they looked ok from the back screen, which, on the 7D is quite superior to the 5Ds(just sayin), but when I got them home, a little off. And when you want an AF system you can trust the 7D is really really hard to beat once you're learned it. Although, I do concede it's not crucial that it's fantastic for landscape.
The other thing the crop sensors get dinged with all the time is "it's not wide enough!!! waaaa!" Sometimes the waaaa really is there.

That depends on how you shoot doesn't it? I tend to shoot on the longer side. The extra reach I get on the crop with my 70-200 has proven useful many times. I recently bought a 24-70 in the face of "it's not good on a crop" type BS. "It's not gonna be wide enough for you!!" The kicker? The difference in view between the 24-70 on my camera and full frame is one 12" step back. One. Not kidding. I tested and measured. Fine, if I were in a cramped room and had a wall at my back it would be an issue. For me that's not a problem because if I were in that situation I'd be looking for the door so I could get outside and shoot something good. But that's me, I understand the need for shooting indoors sometimes, but this is the landscape area right?

On my recent trip to Yellowstone and Banff I pulled my Tokina 11-16 out of the bag only a handful of times because the 24-70 was wide enough for what I wanted. The times that it wasn't wide enough were times that it also wouldn't have been wide enough on a FF camera either. An UWA was what was needed.
I can't disagree with you that the 5D/II has a superior sensor and
can output a better picture. My issue is that you're talking about the very pointy end of needs that not everyone, very few, will properly take advantage of. I can't count all the times I've heard people whine about needing full frame and the fact is they suck. Now, them aside some of your points while valid aren't particularly important and provide only the most modest of advantages. Advantages so modest that better glass should be considered before thinking that these advantages are particularly worthwhile. You notice them, I notice them but really only a small percentage of people notice them. The Nikon guys do very well not having ISO 50 for example. I'm quite happy with ISO 100. That's just one thing, I'm not going to go through them all because it's pointless to and it's been done so many times before.
While I'm reluctant to post my images alongside yours as quite clearly you are talented (and how much of the quality of your images do you
really want to put down to the camera?). Because you are quite good, I've looked through your flickr, fantastic stuff it makes you frustrating to argue this point with. And, actually, this is the crux of it. Most people who debate these points aren't as capable as you. Not everyone is gonna pick up a 5D and get the stuff you have. There's just no way. Most are gonna whine about their perceived limitations of crop and then HDR the poo out of everything they shoot in the face of good taste and to the detriment of my retina. I can confidently say that cause I've seen it now, sadly, literally hundreds of times. I post the following only to suggest that someone with a year and a half of experience in digital and hopefully a kernel of talent somewhere can get some decent results out of a crop sensor.
All were taken with the 7D and are single exposures, no filters (man I'd love me a Lee setup), and processed in Lightroom, which I'm getting better with but still learning. I still feel there's more I can be getting out of this camera/sensor before I start worrying about lower ISO, better dynamic range, etc.
Some of these are double posts from the Landscapes thread, sorry about that.
The Grand Teton Mountains from Colter Bay, Wyoming, USA by
Christopher Brian's Photography, on Flickr
Sunset North of Thermopolis Wyoming, USA by
Christopher Brian's Photography, on Flickr
Flooding in Macoun, Southern Saskatchewan, Canada by
Christopher Brian's Photography, on Flickr
Moraine Lake, Banff National Park, Alberta, Canada (Explored!) by
Christopher Brian's Photography, on Flickr
Autumn at Rattlesnake Point, Milton, Ontario by
Christopher Brian's Photography, on Flickr
Ultra Wide Angle Lake Erie Sunset at Nanticoke Ontario by
Christopher Brian's Photography, on Flickr
Albion Falls, Hamilton, Ontario, Canada by
Christopher Brian's Photography, on Flickr