It's to admit that Canon hasn't released anything very exciting this year (except maybe the 200-400mm, but how may of us will actually buy it ?), and a few new products on the market is always good to take. IMO all the ranting shows mainly the frustration of some people who cannot accept that these days, creativity is not on the side of the brand they support. The A7R might not be for everyone, but for me it will probably be the camera that finally replaces my 5D2s.
I'm into architecture and landscape, I've been doing it for years with a 4x5 Linhof, and couldn't care less about AF or frame rate. What I need is a new sensor, and fact is Canon is not able to deliver it. They may in 2015, but I am not holding my breath for a 7000$ 1Dx HD. Until they have something affordable and available (5D4 in 2016 ?), the A7R might be the camera that will fill the void. With the lens adapter it will cost roughly the price of a 5D3, but in my case it will actually be an upgrade (contrary to the 5D3). The size of the camera compared to the lenses is irrelevant on my Gitzos. And it seems it will be a nice companion to my TS-E collection.
Instead of dismissing every technical progress because it doesn't have Canon written on it, I prefer to adapt and use the tools available, WHOEVER makes them.
I could link this to the Nikon Df, it is nice to see something different (if not new). I am sure Canon would have released a retro styled (A-1) digital camera similar to the Df, it would have been the pride of this forum. But as it's Nikon who released it, it can only be worthless.
These days there is much more excitement with Canon who repainted a 100D in white. That is some real exciting new product. Nice move Canon.