I think truck driving is probably the next thing. There’s laws (at least in the US) about how long a driver can run without rest, long haul routes are generally not very crowded with traffic nor complicated. If you can get twice as many hours out of a robot than a human, you can recoup the investment pretty quickly. I could see a hub-and-spoke model where robots handle the long spots with humans taking the busier spokes.
Tbh, I’m not feeling this. It’s hard enough to find decent priced stuff that fits in a 19" rack, now there’s another form factor to target that could divide that market even further?