Regardless, I expect Canon to drain my bank account just like they always do. Something they are very very good at!
I'm still using my 10-year-old and 9-year-old Canon dSLRs because none of the updates since have been particularly interesting. I have several friends with Canon dSLRs, and they are similar. One is still using his 40D, one is still using his Rebel XT, one is still using his T3i. I'm still using a 20D, 5D and a T2i at work. I've watched every Canon release carefully in the last 10+ years.
Depends on what you shoot. For those of us that shoot sports, wildlife, other fast action, then we would be missing out on a VASTLY improved AF system in the likes of 1DX and 5D3.
I shoot primarily fast-action.
And you stuck with 20D, Xti and 5D???
Just the 20D and 5D. The Rebel is for work, which is not fast action.