Think of it as switching every keyboard in the company for a Dworak version. That will not meaningfully affect your average programmer's productivity, as their typing speed gained from a faster layout gives only diminishing results. Dworak only makes sense for a programmer that really benefits from >100 words per minute, and most really don't. The bottleneck it the programmer, not the input. The same goes for VR, unless you have a special case as I have mentioned before.
Let's say you type 300 lines of 80 characters of bug-free(!) code per working day of 8 hours. That is an pessimistic estimate( for my theory ), average is much lower.
Let's assume the average typing speed is 60 words per minute. That gives you 83% of the time not spent typing(!). Doubling the speed to a very fast of 120 wpm, only gives you 92%.