I watched a company almost go under(shrank to almost no employees) after exactly what you described. The BFEDs(including the CTO) refused to update their skills and the company tools/stack and the company was beaten out by competitors.
If you decide not to use a technology because the developers can't or are unwilling to learn them, you've got bigger problems than technology choices.
I'd say you also have a problem if one or two devs want to use a tech but aren't also willing to train the rest of the devs in them (passing around links to a few tutorials doesn't count as training).
Indeed, the irony is that many shops full of junior FEDs found databases and stored procs so intimidating that we saw the rise of things like MongoDB. Even if it completely sabotages any medium or long term plan, if all you know is JavaScript and have very naive notions about the uses of data, seems great.