Upload & Sell: Off
Well, speaking personally I have so much tied up in Canon glass I am highly unlikely to sell up and buy a Nikon system.
However, my 5D2 and 7D promise to meet my needs for a long time to come, and so Canon's next problem is how to tempt people like me to upgrade.
Keeping or lowering the megapixellage won't do it.
Keeping existing 5D AF won't do it either.
I am sure Canon will get me to part with my money sooner or later, but the question is "when" and "how". The 5D3 or 7D2 would have to offer something very tempting indeed to get me to empty my bank account. I'm not sure what that something could be, but that's Canon's job in a nutshell.