I would just undo all the mergers and acquisitions. In 90% of cases, this just results in the games being worse, and the magic that made the studios great is extinguished.
A Pokémon remake by Valve. It'll come out a decade late, sure, but knowing Valve, they'd try out a bunch of new tech and mechanics (desperately needed by Pokémon) and then polish it up to excellent quality.
Albion from 1996. The old game from Blue Bytes. I just need the same game, but running without emulation or dosbox on new hardware and maybe some upscaling, nothing more!
I don't know what studio (Rockstar maybe) but I'd love a revamp of Freedom Fighters. I reinstall and play through the that game every few years. It's really almost perfect as-is but graphics could be modernized and AI could be a little less stupid.
Mechwarrior. The first one. Remade by Piranha Games or some indie outfit, just respect the material, expand the universe, mission negotiations, recruitable mercs, fidelity. Keep the story.
I'd let Emily Pitcher from Sondering Studio remake every single game with soundtracks composed by Lena Raine. This includes Chicory, Celeste, and of course, Minecraft.
It would be kinda difficult for her to remake that last one ngl.
Also, I'm the one that remasters the soundtracks to make them sound like they came out of a Sega Mega Drive (for Muricans: Sega Genesis). This is clearly the worst idea I've ever come up with considering how long this would take especially for only 2 people.
ToonStruck, remastered, or the shelved sequel ressurected. I'd like Burst to (exist again and) handle the development because they did a fantastic job the first time around!
Edit: not because CDPR did a poor job on it. The Witcher games are my most played games on Steam. I'd just be super interested to see a FromSoft take on the combat and storytelling.