I agree with the last half of MR_Me. Chains of Olympus should have totally been able of the collection.
I don't agree with the rest though. GoW on PSP was fantastic. It was possibly the best PSP game and I' sure it sold a lot of copies, and probably sold a few systems as well. So, I think they should make a new one for the PSP.. as Soon, the PSPGo is failing and interest in the PSP in general I believe is dropping due to sparse releases, too many "ports" that simply don't transition well. the PSP needs a fresh game to spark some interest.