I do think this is true - if you don't see the advantages of learning a new tool then you won't feel motivation or energy to do so - but I can also understand that it has to be done because of career reasons.

I mean if you were all in on e.g. Backbone.js or Dojo ten+ years ago, you're kinda running behind now and it'll get harder and harder to find a gratifying job.

I can see it happening for Vue vs React as well.