It's not a meme just because a lot of people believe it and you don't...
I want BC. A lot.
But I'm not out of touch with reality. It's not a significant factor for sales.
It's significant as in "I sure as hell won't buy 720 if I won't have access to my library of 35 on demand games, 117 XBLA games and 132 Indie games". Of which I still have to play one third. I want my library on my next Xbox period. If they don't give it to me I take my money elsewhere, most likely build a nice gaming PC and return there after a decade of console only gaming.