I can understand Canon "reusing" the 18mp sensor over and over again as Nikon has done the same with their 16mp sensor and now new 24mp sensor. It makes good marketing sense, in a way. I just think that it has been more noticeable with Canon as the last 5 years and 9 camera bodies have been 18mp even though there have been some small changes between certain sensor designs. Noise levels have not gotten noticeably better either, so naturally, people have become frustrated.
The 7D is 5 years old and I still think it is one hell of a camera body that is very capable. All crop sensors have noise so if your job demands noise free images, you are not looking at crop bodies anyway, you are shooting full frame.
I think the last couple great cameras from Canon were the 5D3 and 1DX and other than that nothing has been released (in MO) from Canon that is ground-breaking or anything that would make me want to give up my 7D and 40D backup. I still use my 40D and the images are stellar, I will never give up my 40D!
Hopefully, IF Canon makes a 7D replacement, it will show the "world" what a great crop body can do!
I agree the 7D is still a great camera, capable of taking amazing pictures in good light. It suffers a bit in low light though. I think a 7D replacement isn't out of the question but I am starting to doubt if it will be this year.
If Canon put in a completely new sensor, dual Digic 5, with DPAF, perhaps wifi and and touchscreen plus a higher burst rate and 4K video a lot of folk will be happy. Even without the 4K video (which I think is a stretch) this would be a great camera. Improvements to ISO noise are prob not going to be groundbreaking but hopefully better than what it is now.
Also, I think the 6D should be in the category of something great released recently. For the price you are getting superb IQ and features. It pretty much brought FF to the masses. Before that the only cheap options were the dated 5D cameras. For the same price as the 5D2 used you get a similar spec'd camera but more modern and with insane high ISO usability. Four years ago that was unheard of at that price point.