You underestimate the will to play gta 6 by people. Necessity is the mother of invention. GTA 6 on pc as a possibility is literally why this project gained attention.
The game is going to sell like 100 million copies, half a percent is still 500k people .
Most folks will just do something else.
Also underestimate that AI can be used to build a one click type installer (improve massively the install experience). The TitanFall 2 VR mod is an example of such a thing, the install experience is great, the mod is exceptional, it’s a great showcase of what AI coding will bring to the modding scene.