Interesting post!

As a theme shop, my concern is the future of WordPress themes. Matt and the Gutenberg team have been trying so hard to bring Gutenberg into the core, while the future is really vague.

"Let the market decide" is not a good answer in my opinion, since theme is a huge part of the WordPress ecosystem. I've been seeing people are selling their theme business because of this.

What we predict now is theme will be something like a library of predefined templates, starter pages or blocks. But is that the plugin territory? What's the clear border between themes and plugins now?