Earlier quoted context omitted.
If you haven't got SV money behind you that's even more reason to focus on delivering something that works. Your own project on your own time? Go for it. Clients should get the best fit, most reliable option, not the flavour of the moment. (That all said, RoR is not a great choice these days as it is a niche skill)
Assuming your field is web development, what is not a niche skill? It seems the choice of backend frameworks is somewhat fragmented with no clear default winner.
It can be difficult to recruit for now.
(Also no, I'm not in web development, I have just observed this)