After he releases 1.0, they are doing to focus on wlroots which he does mention in the post. It is looking really promising and even now sway is still very usable.
I've always wanted to try my hand at making a window manager(or what is now called a compositor I think), so I may use wlroots as my base when it's done(or at least more done). The article confused me a bit, is the goal to have wlroots 'done' for the 1.0 release, or to release the 1.0, and then at some point move it over to wlroots?
We're releasing sway 0.15 based on wlc. It will be the final wlc-based release, and the final 0.x release. The subsequent release, 1.0, will be based on wlroots, which is nearing completion now. https://github.com/swaywm/wlroots
The man himself arrives! Thanks for the clarification.