I am supporting the idea, but I think minimum stability/feature level needs to be achieved. I have not tried Wayland for few Plasma releases with Intel graphics, but the main issue I can see is nVidia hardware. Proprietary nVidia drivers do not support Wayland and don't plan at this moment. Noveau does not support re-clocking for last 2 generations of hardware already (and I'm not sure the state of wayland support), so it leaves out a lot of people.
Overall I think it will generate a lot of feedback that will push forward the development, but I'm not sure if KDE is moving fast enough to provide good user experience. It's a tough and not obvious call in my opinion. If it is going to be the default, it needs to be well tested and limitations need to be well understood.