We will see the true dissatisfaction when 5.0 will roll out. For now only early adopters have tried, and mostly hated, Gutenberg. When normal users will open up WP after the 5.0 update and won't find the old editor, that's when we will see the real freak out. I predict that Gutenberg will be removed by version 5.1 otherwise I think WordPress will soon begin to be abandoned.