Backwards compatibility may not have been a big thing previously, when the release of new systems heralded a giant leap in technology, but today it is. The SNES outclassed the NES in every way, and the N64 put the SNES to shame. However, while the Xbox 360 is definitely better than the Xbox, and the Xbone is better than the 360, those improvements aren't the giant leaps that occurred in previous consoles. They also have a HUGE list of titles attached with each one that remain in the hearts of the gamers that played them.
I still have my old SNES, and my old Sega CD-X, and my Dreamcast. I have games for them, and I've played them and had fun with them. But if someone made a system that let me play all my old games on one system, and added a bunch of new games to the mix, then I would be VERY, VERY INTERESTED.
Just something to think about.