Really? Is this actually a concern to anyone who's been programming for over a year?

The only remotely challenging part might be symbols on the number row (that's for me at least). And for those, there's actually NO reason you couldn't have a virtual keyboard you can look down at.

There's a bias here. Most of the users of this site likely use a keyboard as part of their daily jobs. Proficiency in touch-typing is essentially part of our jobs descriptions.

Can the same be said for all potential users?

Been pretty confident since the 3rd grade.

Approximately 100% confident. You should never need to look at your keyboard.

I've actually thought a great deal about this. I think the solution is a keyboard that exists both IRL and in the virtual space: some sort of cheap system to keep track of its relative position with respect to the VR headset would allow a user to look down and "see" the keyboard in virtual space as it exists in reality. There are a number of unknowns that would need to be probed if somebody were to pursue this solution directly, but I don't work with VR stuff so I can't see if it would actually be useful in practise.

Are you serious? Hiding the keyboard is like the first step you do when you start practicing touch typing.

MS HoloLens solves that. If text is clear enough. May be better as an addition to the main screen.