It will be a shared world multiplayer-first service game so it can be an AAAA game like that recently released Black Flag add-on that got out of control.
Also: The world has become super toxic regarding basically everything mocked in GTA. I highly doubt GTA 6 will be even a bit like previous versions. It will end up as toned-down unironically “woke” cashgrab. To me, GTA ended with GTA V.