you can write perfectly safe software in it.
In the same way that you can safely walk through a minefield.
I dunno what you mean about it being an expressive language either. I would say it is relatively low on the expressiveness scale compared to something like Python or OCaml. It's basically as expensive as Go which is renowned for being unexpressive. Maybe you didn't mean "expressive".
You seem to have the idea that there are "people who want RT" and they'll overcome any inconvenience to get it, therefore making RT more convenient to use won't increase use of it.
Clearly nonsense, and I think the GPS analogy is a good one. My mum isn't "a person who wants GPS" and she would never have bought a GPS device in the 00s, but she uses one now because it's conveniently already available in her phone.