That's too grand a plan. For one, it would essentially mean he'd be shackled to a single project for the rest of his life. He'd experience burnout long before the halfway point, and abandon it.
Two, these long dev times are not conducive to a decades-spanning game. Like you said, advancements in technology will make the early parts of the game look even more ancient. The better his setup, the more ambitious he gets with scope. 60 FPS is completely unnecessary right now, just imagine if he doubles it again, maybe goes up to 4K resolution for the game.
Look at current TV, and how many years pass between short 10 episode seasons. It would be even worse for BADIK.
Three, the branching would become unfeasible. The college setting keeps the story focused, but once that's gone one of two things will happen: either he sticks with every single path and creates individual stories for everyone, with no unifying element, and the development expands exponentially. Extremely unlikely, especially if he stays a one man team.
Or he prunes the branches, forcing all the stories—no matter how disparate they've become—to converge and start back at square one. Everyone is doing post-grad work. They get jobs at the same place. They move in together. Something happens where the majority of the cast still see each other on a daily basis, stay in the same area, and romance is still blossoming all over the place. A reboot, in other words.
There's more to consider, but I don't want to spend an hour writing my thoughts on this. It's just not likely this is an actual consideration.
