Most of our screen time is spent working. 8+ hours staring at a screen is bad enough for our eyes and brains. Imagine how much worse it will be when that screen is an inch from your eyeballs. I highly doubt that VR will be replacing screens for anything but occasional recreation anytime soon.
I don't find there's too much difference between staring at a computer screen and using VR. VR headsets do provide a motivation to create displays that can allow your eyes to focus on closer or further objects though since they aim to reproduce reality and a big sticking point is the fixed focus nature of all current headsets. We'll have to see if there are any announcements at the next Connect event since they've been working on this technology https://uploadvr.com/half-dome-3-prime-time/
