It looks like a game that is CPU limited on the PS5/XBS. Ram/GPU wise switch 2 should be fine but the Switch 2 CPU is so weak comparitively.
If PS5 CPU is only good enough for 30fps the game would require a massive amount of work to the underlying simulation to get it running at 30fps on Switch 2.
Optimising a game to run on a weaker gpu is a lot easier than getting it to run on a weaker CPU.
So unless GTA VI isn't pushing the PS5/XBS CPU as hard as generally believed it would be a very big undertaking and rockstar aren't exactly known for being a studio that offers universal platform support for their games. If they don't wanna port they don't.
Personally I don't think it'll ever come to Switch 2.







