hmmm while the new iso improvements are good I would much rather be shooting at f2 and ISO 3200 than f2.8 and ISO 6400
I was thinking more of the Uncle Ted's and landscapers
Uncle Ted's where a budget lens to go on their Rebel is a good move
Landscapers where f# is less critical.
ie put the money once in the camera and several low price lens is cheaper than cheaper body and expensive lens
The real trick will be to get top IQ from the low cost lens - and one way is to slow it down. 10 years ago a f/2.8 would have been fast
Clearly there will still be a market for the more specialised kit