I think a lot will depend on what Canon may/may not do in regards to a true mirroless camera...If Canon does move forward with a mirrorloess camera, your probably looking at a body based on the GX1 sensor or a APS-C, so were probably looking at something in the $1000-1500 range...Where does that leave a successor to the 7D/60D/T3i's?
If the 5d Mk2 eventually goes away, a 7D Mk2 could move up the chain and take over the 5D Mk2's spot and sell for $1900-2400 but then where would you put a 65D if you also have a mirrorless camera coming to market in that $1000-1500 range? You could slot a 65D in the $1200-1600 range if they basically turn the GX1 into a mirrorless camera and say it's priced at $1000...But given Canon's recent pricing trends, I doubt that...The next 6-8 months should be very interesting for Canon's mid to low level camera range indeed...
One thought that occurred to me is if a mirrorless camera is coming...a great marketing angle for it would be...
"Welcome the new Rebel"
...and it would replace the entire rebel lineup...