Well I don't see the 1.3x sensors taking off for Canon.
In 3 years, I expect Canon to possibly reduce the number of cameras in their lineup with APS-C sensors, and replace those with more FF ones. However, I don't see other companies following suit. Canon will offer way more FF options than anyone else.
I expect Canon to have a "400D" to replace the 350D, and a 450D in the pipelines. The 400D will have a 10 MP sensor, a 30D will have a 12 MP sensor, and the replacement to the 5D will have a 16 MP sensor. From there, expect 22 MP sensors for the 1Ds, but no more than that.
For Nikon, I don't expect FF. I expect them to stick with their small sensors, and offer VR in almost most of their mid to upper level lenses. This includes an 18-70 mm with VR, for example. I wouldn't be surprised if Nikon started buying CMOS sensors just to stay on par in the MP "race" and compete with the likes of Canon.
I expect Sony to be using CMOS as well, since they work on such technology anyway (they use one in their (expensive) DSC-R1 prosumer camera). Maybe Nikon will get their sensors from them?
Oh, and I think 2 camera companies may "merge" or one may take over another or something (although this won't involve Canon), or at least share a lot more technology. Sony might make an impact in the dSLR. Not sure about Samsung.