Another one would be The Getaway. It would cost a lot, but in today's market an AAA open world game with the value of sony first paty effort would be seriously big. Also they could bank on the longer and longer development cycles at Rockstar. The more serious, realistic, cinematic style of the game would be superb on today's technology.
The combat was one of my favorite parts of Legend of Legaia. I liked stringing together different button combinations to try their secret combos.
I've always been a sucker for RPG combat systems with timing-based inputs or other such things. I wish the battle system was given more time to shine. Never played the sequel but I heard it wasn't as good.
Also voted for Dark Cloud (the market would probably love it) and Folklore (wish we could've seen a better-polished sequel)
quick EDIT: oh and a proper Patapon 4, please.
Who ever is in charge for remakes at Sony, please consult this thread or ask me. NO MORE MEDIEVAL CRAP
Fucking TOMBA made it but not SOCOM. Am I missing something here?