I'm still bummed that 60fps God of War, Last Guardian (and probably a few others) are locked behind (what I believe is) an obtuse workaround. Ugh. I feel like Sony would address this if the community were loud enough about it. Yeah?
I could see a few of them having these upgrades locked behind a 'remaster'/PS5 version, like Spider-Man, which comes out with (or ideally precedes) their sequels this year. Probably no such luck for Last Guardian, though.
I expect Avengers to get a next-gen relaunch later this year or early next year. Visual upgrades, but also a systems rework, packaged in one as a fresh overhaul. Sort of like Diablo III's "Loot 2.0" system and expansion, which overhauled a lot of how the game worked and gave it a new lease on life.