Yup. I'll probably buy the first next gen console on release if it has BC because I can just swap it into the space occupied by the previous model, switch the wires around and I'm done. Can still play all my games, the old console can be sold, scrapped or whatever. If there is no BC I'm going to be reluctant to get rid of one box for which I have a large library for another which will doubtless come with a load of pretty, yet shite glorified tech demos and rushed ports of games I already own. So I won't. I'll wait until the gap in quality is too big to ignore or maybe not bother at all. BC is very important to me. It's one of the best things about steam.
Yeah... I still really don't know how that's going to go next gen. It'll certainly affect how quickly I buy the machines though (BC = bought much earlier).