I don't know about using the 7D as a guinea pig. It seems to me that plenty of pro wildlife/sports fotogs were happy with the 7D being a crop sensor as it gave them more reach. It could have been the case of canon marketing saying - we have the sensor, we have the AF system, why not. They only had a pro AF system on the 1D cameras. Putting it on a crop sensor camera is just a way to use what they already had without eroding too much the sales of the 1D system. How many sports fotogs do you see walking around with a 1D and a 7d strapped to their photography vests. I see lots.
APS-C works. Once upon a time, 4x5 film was the stuff. 35mm film killed it. Sure now, and 4x5 quality will always beat 35mm quality. However, there are qualities beyond sterile image quality. FF digital requires lenses which are more expensive. It requires a larger camera. It's lenses are shorter. APS-C has serious benefits.
Nikon knows this. see how much they have put into their DX lineup? If Canon boggles this, Nikon will gladly scoop up disgruntled photographers with a shiny new D400.
Push this argument further and you get little cameras with iPhone sensors
Push it the other way, and buy Phase 1 digital backs. You will have all the quality you could ever want, and everything you've been missing out on with your FF sensor.
APS-C has major benefits over FF for portable wildlife photography. For what I do, even a 1Ds MK III would not suffice. It would require a bigger more expensive lens, and a lot more lugging. FF and APS-C are two different solutions to two different problems. And they both do their job well in their realms. But to nix APS-C in the 7D for full frame has far more drawbacks than benefits.