There isn’t such thing as a WM under Wayland. There are only compositors which make up everything such as the WM, Effects compositor, io etc. To standardize things for smaller compositors things like wlroots exist. Creating a basic compositor using that is around 100 lines of code
Even if Google laid off staff for the Flutter and Dart team, I don’t think those two will be going anywhere any time soon. Mostly because a huge majority Android ecosystem is based on them, still a stupid decisions of them.
I hope this doesn’t age like milk.