The ultimate GTA. All of the best engines in one game. Driving physics from Assetto Corsa/Gran Turismo. Soft-body physics from BeamNG. Flying from Flight Simulator/DCS. VR mode a la Alyx. Shooting from RDR2, melee from Sekiro or similar. When you stop to play basketball, it's proper basketball a la 2K or Live. Same for pool, bowling, etc. Destructible environments like Battlefield or Teardown. Choices matter. Written by the guys who did Disco Elysium and the guys who did Portal/Portal 2.
You said I could dream!