The X11 server can render to Wayland. X11 applications can talk to that X server. There is no way that Wayland can make things worse for you or anyone else. It can only make things better.
Well, I guess anyone who loves actually working on the current monolithic "Do everything in the X server" code might find it worse, however it seems everyone actually doing such work prefers and is looking forward to the Wayland approach. That should tell you something.