I think you mean "easy to hire"-technology. One time it was Java, then it was PHP, now it's becoming node.js and angular. Maybe it's a bit soon, but it's far from insane to bet on these technologies nowadays.
For example, I've worked in a number of environments that hired for node.js, but where the devs were actually recent RoR converts who were moderately proficient in node.js and its ecosystem. In the case of getting an MVP out quick, it might still be better to use RoR.