I don't think wants to enforce the trophies on PS1 and 2 titles. I guess that will be done by devs that want to take advantage of the possibility of the title being put also for sale on the store and this will entice people to buy those games even if they don't go for PS+ Premium.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
http://gamrconnect.vgchartz.com/post.php?id=8808363
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
http://gamrconnect.vgchartz.com/post.php?id=9008994
Azzanation: "PS5 wouldn't sold out at launch without scalpers."