VR for phones will mostly be for people who are into gadgets but don't have any particular interest in games.
Carmack is porting Minecraft to GearVR, and new game from Monument Valley devs has a good chance to make a splash on mobile VR with their Myst-clone adventure/puzzle game. I think there will be enough VR gaming content on mobile, but of course the scope of the games will have to be scaled down [visually, input-wise and tracking-wise].