Also perhaps more people would start buying VW camper vans. VW are planning an electric version [1].
[0]: https://www.bloomberg.com/features/2016-tesla-camper-mode/
Well, it's solved. They're called RVs. As a kid (or even as an adult), I think I'd still find it being pretty cooped up. It's one reason that I've never taken long-haul Amtrak that I suspect I'd find is more interesting in the theory than in the practice.
There are some pictures of various Amtrack train interiors at [1], aimed at tourists. That toilet next to the seat is weird, I think I'd prefer a shared toilet at the end of the corridor. But overall, the US has very spacious long-distance trains.
(I have taken one long-distance Amtrack train, for about 11 hours. The standard seat was as big as a first-class seat in most of Europe.)
I suppose as long as you get in the hours you need to as a remote worker and the sleeping is comfortable then this would be pretty sweet for even very long journeys.
It would take a complete redesign of car interiors to something far more comfortable/secure for lying down but no reason that problem couldn't be solved.