Something new is coming. The new era of WordPress.
I think the idea is great. I also think when it’s a default feature it will cause a lot of troubles for older websites. Well… this is the cost of going forward and pushing new – much better – solutions.
Can’t wait to see the earthquake when WordPress 5.0 ships in April. I believe we will have a lot of extra work in WP Served team. ;-)
For now Gutenberg is just a WordPress plugin (you can download it here) but when WordPress 5.0 will be officially released it will become a default content editor and TinyMCE will be retired.