In reply to Mike Schinkel.

What do I proposed as the solution? Include a "beta" Gutenberg plugin shipped with core in WordPress 5.0 to ensure many people try and use it, but also to stop from "setting it in stone" until a large number of people have validated the architecture. AND I would target WordPress 6.0 for Gutenberg's inclusion in core.

I really like the idea of beta plugins, the whole install yourself via .org is first step when thats been tried including the plugin as a core plugin could work to get more feedback. All this requires that core team collects usage data as per Mortens suggestions.