It is nice thing to have, but it is not very important, because if it was that way, the $600 PS3 would have sold like crazy, but it did not and that is why Sony removed it, and then the PS3 began selling better because of the reduced price.
I would like to have BC, so considering that emulation through the digital versions of the games will eventually happen (like with PSP games on the VITA), I am buying all my games Digital lately XD.