Nope, while it is possible to run normal X11 apps under Wayland, there is no support for running X11 window managers.

Which is a damn shame, because window managers are where some of the greatest innovation is happening.

X11 window managers are replaced by wayland compositors. they are more complex, but multiple alternatives already exist.

Sure, but those are not backwards-compatible. If Wayland let me run my existing window manager then I would be glad to try it out.

i am responding to "window managers are where some of the greatest innovation is happening"

innovation is happening with compositors too.

Xwayland exists, but you need a compositor to be running to encapsulate the Xwayland container.