The joke will be that by the time it's released, they'll now be recommending players buy a PS6. This is actually kind of mirroring the situation when GTA5 came out. It came out at the tail end of the PS3 era, and that's the version I played. When the PS4 came out, they then came out with a new version of the game with more content and better graphics. By the time the PS5 came out, they put out yet another version.
So yeah, they may be recommending a PS5 for the game, but you can bet they'll milk it for all it's worth to get people to buy the game twice by releasing a newly improved version for the PS6 when that comes out, and then the PS7, and then.
The big elephant in the room of course is what they end up doing with GTA Online. GTA Online is so successful, such a cash cow for them, that they can't afford to make a mistake. My guess is that they'll keep GTA Online's Los Santos around for the forseeable future, but that a new version featuring Vice City will be there and allow characters to travel between them, but not retain their wealth in order to keep a level playing field.
I'm still miffed about what happened with Red Dead Online though. They gave up on that because their expectations were too much. Both games have very different demographics and encourages different play styles, and I feel they were expecting RDO to be just as much a cash cow as GTA Online. That was their biggest mistake. It never could make as much as GTA Online. If they would have been comfortable with the idea that the game never would have made as much money from the very beginning and just accept it for what it was, I think it could still have been something special. The base game certainly was. The crazy thing is how much more advanced a game RDII was in comparison to GTA 5, yet they've kept going back to GTA5, a game that originally began in the PS3 and 360 era. That's a long time for a game.