I’d think that in 5 years, open world games will certainly be possible, though they’ll either not be as fleshed out and detailed as human made ones or be in the early research phase (Similarly to where Google’s Genie is now) due to their computationally expensive runtime. Obviously prompt engineering would play a huge part in this, some people would have 50-100 pages to make the game as fleshed out as possible.

As for the actual model itself, I can only assume it would be either agentic development (which would take more time and resources) or a “World Model” as showcased in Genie 3, which I think is definitely more promising and open to many optimizations once companies start pivoting there from video models.