Gutenberg is going to break so much and cause so much pain from end users that have no idea why their site is breaking. I predict WP will be forked this year when that rolls out for those that want to stay away from it.

Contrary to what many people try to tell you, WP is not at all easy to set up for the average user. Heck just to start you gotta immediately install 3-4 plugins just to get WP to acceptable levels of performance... security, speed/caching, backup, spam control, etc.