We've had this question posed to us over the years multiple times. Just replace the SharePoint Framework with any of the previous development models, and you'll see this question is something that is impossible to answer with certainty. For now and for the past few years since Microsoft announced SPFx to be a first-class development framework for SharePoint, the answer has been a solid yes. We're seeing SPFx pick up a lot faster than previous models, and the support that both Microsoft and the community are providing has been excellent so far.
A major influence on the adoption of SPFx has been through the Office Developer Patterns and Practices, which is a highly active program to educate and evangelize the SharePoint Framework, among other things.
While we're seeing enthusiastic reception for SPFx, we're also seeing developers who are still not yet ready or willing to move to this new development...