I don't think they can release trophies for them, they're essentially the original PSOne file running on an emulator in the PS3, and not a great one at that. I love my PS3, but let's be honest here:

there's emulators out there that can make these older games look even better than they originally did on your computer screen. Computer screens are a lot higher-resolution than HDTV's. So there's really no reason the PS3 can't have a half-way decent emulator to not make the games look so jaggy on an HDTV.

BACK TO trophies... b/c it's just the PSOne file, you can't add trophies into things like that. I suppose what would have to happen is for the game to be packaged as a PSN game instead of a PSOne classic. I'd personally like it to happen, my player/trophy level would shoot up from all the classics I'd be playing.