I still think theres plenty of room for a pro or close to pro level crop body, which is what I see the niche of the 7D. the xxD series never was nor is a close to pro level series body. The current 7D is as close to pro level as we've seen in a crop body (unless you count the 1d4). The 2 factors that make it the good close to pro option - it does have good weather sealing, it does have AF micro-adjustments and its does boast a pretty high fps. The 60D messed up the potential for the xxd line if you ask me - that flip out screen is so gimmicky, but, it's real nice if your a smart phone photog person, makes ya feel like you are shooting on your smart phone and I don't have to look through that little viewfinder....To me, its just a silly add on that will break after more than average use. Let the xxd line be what it is, a nice uber rebel for the hobbyists and amatures with money to burn. But keep the 7D line running and step it up a notch.
I like my 7D and feel that it can produce great images. By mid-summer I should also have a 5dmkiii as well. Not selling the 7D though, it will stay in my bag as the backup, or as the go to body for situations I don't want to risk the mkiii, or, for times i need a little extra reach out of my 70-200mm. The only reason I'd sell my 7D off is if I were to find myself in some sort of financial collapse, or ----if they were to release a 7d2. And in my mind, it wouldn't have to be a mind blowing revolutionary upgrade. All that really needs to be done is improve the noise in the 3200-6400 range, maybe bump the native ISO to 12800, not a deal breaker though if it stays at max of 6400 as long as 6400 becomes more usable, which if it had dual digic 5's i think that would cover any noise issues. fps, no change, its fast enough. Af doesn't need too much step it up to 41 points though if canon wants to grant the xxd line the old 7d AF. Do that and canon has a solid $1800-2000 body - which i do believe many people would jump on - not because its the omg gotta have this camera camera ---it will draw in the wow i want a 5d3 but can't shell out $3000+ on a body crowd. It would be a fine choose as a backup body for many who do have FF bodies.
I personally think the only reason canon would phase out the 7D line is if they were to come out with an entry level FF body at around 2K (basically a slightly improved 5dmk2). the current jump in price from the xxd line to the 5d3 is just too steep. Something will need to fill that void (i am sure nikon and sony are looking at that void and wondering how many sales they can steal from canon with bodies between $1500-2500)...I don't see the xxd line filling that void - before the 60D maybe, but I really doubt many will jump at a $1700 70D with flip out screen....