I've worked with Wordpress a lot over the years, so I'm very familiar with its inner workings: this is what's largely motivated me to avoid it when possible, and unfortunately prevented me from contributing to the project.
Given my initial reaction to Gutenberg, I'm imagining the community at large will hate it. The Wordpress community is one that champions amateur, dangerous, big-ball-of-mud software development, under the guise of being "beginner friendly" (where "beginner" = "not experienced enough to be leading clients to believe they can provide professional-grade solutions"). This is a mindset that favours hacks and tech debt. over refactoring, and Gutenberg is definitely going to force both plugin and theme developers to rethink, and rewrite their approach (in a positive way, imo).
If it successfully brings Wordpress out of the dark-ages, that's great obviously. If it makes Drupal more pleasant and easy-to-use for editors: also nice. If it kills Wordpress due to its community migrating away, then at least it could leave room for some more modern competitor.
I just hope the core devs don't do a U-turn on Gutenberg.