I think the idea of change is often harder to deal with than the actual change itself. Moving to Gutenburg will be like getting a shot at the doctors's office . "No, No, No don't do it!... oh... it's done..." We all hate change, and then we do it and realize that all of the hype was just that... empty hype.

I predict at the 5.0 rollout our average users will be like, "Whoa this is different... okay, let me figure this out... oh, that was pretty cool... this is better than that old clunky interface we had before."

Retraining? How much time have we spent training on the current editor?

I do think that Automattic would be smarter to improve WordPress core, complete the REST API, and invest in making it a better tool for developers rather than the end users (give us what we need and we'll create better tools for the end user). But to say that Gutenburg will fragment the community and that a fork is actually viable is ridiculous and short sited. It's pulling an ember away from the fire... it can't sustain on its own.