I thought i cared about BC till i thought about how much i played my ps2 library since i have all these ps3 titles.
I dont.
i have a library of PS2 games and at the moment no way to play them other than PCSX2 which has compatibility issues.
i care about backwards compatibility to the extent that i wanna replay through my old games at some point. really though the PS4 should be strong enough to flat out emulate all PS2 and PS1 games. i don't think anything in this console generation will be able to emulate the Cell processor so that era of games will likely be lost once the supply of PS3s dries up.
Gakai streaming isnt' only about streaming PS2/3 games to the Vita. Streaming PS4 games looks to be cool. Also how is streaming the game going to stop hd remakes?? I'm assuming you need to actually own the game to stream it. I doubt you just pay for the service and stream w/e you want sans having the game.
HD remakes put an end to bc on most mainstream consoles. they figured out the Square Enix plan of reselling the same games as multiple remakes over and over again.
but honestly how much can they really charge a person to stream a game? it can't be much since you don't even physically own the game and an internet connection would be required to stream. are you gonna pay $10 to stream a Final Fantasy XIII when a physical copy on the PS3 can be had for close to that used and you'll own it?
as for streaming PS4 games why bother? unless its to a Vita on the go i'd rather just buy the game.