Maybe it's not a make or break feature, but backwards compatibility is a good safety net. Most of the new features they've unveiled I really don't care about. They're cool in their own way I suppose. Voice activated commands would give me that rush of feeling like Picard, though I'm not sure that would last when I asked for Earl Grey and thoroughly confused the thing.
The point is, I'd be willing to risk some money on a new, fancy console if I knew I had my library of games to play on it. I know my 360 won't last forever, and it would be nice to still be able to play those games down the road. I never purchased a game and thought of it as disposable. Is that the new reality?
Sony made the same error of course. I recently borrowed my brother's PS3 and very quickly fell in love with it. I thought about buying my own, but I figured I'd wait for the new console. Why buy a PS3 they'll be phasing out when I could just buy the newest console? I'd catch up on all the PS3 games I'd missed while picking up new PS4 games that looked good as they came out... It was such a nice dream.
I guess it was silly to expect a Playstation to play Playstation games, or an Xbox to play Xbox games. I said this a while ago in another thread, but wouldn't it make more sense to just call these machines something different? That would get rid of a lot of the expectations. Instead of Xbox One, just call it One. Then we would know it wasn't built to play Xbox games, it was built to be a home entertainment system. I don't know what you'd call the Playstation, but something to indicate it's not a Playstation anymore.
Needless to say, this issue combined with many of the others means I won't be buying any new consoles in the near future. My hobby let me down. That kind of bums me out.