It is reasonable to want remote desktop access. I am unfamiliar with the RDP technique you raise, but expect it could be achieved through VNC or similar systems.
X-Windows is itself a weak response to remote access. I have memories of trying to use Oracle Forms over a modem connection to uni, and finding it far inferior to VNC connections to work systems - effectively unusable.
The remote-windowing mechanisms of X-Windows are coupled to aspects of X-Windows that Wayland was created to overcome. The video 'The Real Story Behind Wayland and X - Daniel Stone' discusses this.
Microsoft Windows does not do remote-windowing in the X-Windows sense. RDP is not Explorer. From what I read, a RDP-like-thing could be built, and Wayland would not get in the way of this. I think the Wayland team make a clear case for why this is out-of-scope for them.