That VR isn't "mainstream" or in every household is sort of like saying there's no reason to make VR games at all. Yet VR games exist, which means there must be some sort of market for them.
And Sega wouldn't even have to build the game from scratch, which most VR games have been. This mod's very existence is evidence enough that it didn't take much to transfer the game to the platform. This dude made the mod all by himself without getting paid. All Sega would have to do is work out a deal with him to add VR support to their game. It would be incredibly easy.