Although I've been an AMD user since upgrading from the second-generation Celeron, Ivy Bridge will probably be included in my final, last ever build. I don't think desktops are going to be feasible five years from now and with the focus on tablets, ultra low power laptops and console games, the top Ivy Bridge non-Extreme model will probably be enough for the next five years.
After that we're probably looking at a tablet-like computer that can seamlessly and wirelessly connect to nearby displays, input devices, etc and the desktop will be history.