Let's just say that this will make sales records regardless. But if it's a Starfield or Cyberpunk situation where it underwhelms, Rockstar may be screwed long term because because their games are so high budget. They've released two games in the past ten years. This leaves little room for failure or even mediocrity. GTA has morphed into a prestige game and it's high risk high reward. If this game isn't ground breakng great and especially after a ten year wait it will permanently scar Rockstar's reputation long-term.
So it won't bomb but if it's not incredible R* could be in trouble.