I assume you're referring to the Quest? Is that a statement based on your experience playing games on it, or what you assume they'll be like?
I view it less like mobile games, and more like games put our for the Gameboy. Specifically tailored to achieve good and consistent gameplay based on the target platform. This is partially because Oculus is being very demanding in what they'll accept for their store, to the point that there's actually not a huge catalog, but each item seems to work very well.
Along the lines of the Gameboy comparison, there's been a few stories now of developers taking a game people thought couldn't make it to the Quest and optimizing enough for the platform that it performs well. There's something to be said for consistent hardware.
The price and inherent limitations (such as motion sickness) of VR are going to ensure that it doesn't hit mainstream, at least for the time being
On modern hardware, motion sickness is only really an issue in VR games which move your head around in-game in ways which don't match how you're moving in real life. Teleport and physical movement don't cause issues for most people.
(The price of the Index definitely doesn't make it mainstream though. Just trying to get a sense of this issue)
On the other hand, any game where your movement in the game world doesn't match the real world is a quick path to sickness. Any racing or flying game makes me ill, and I've been playing VR for over 2 years.