Wouldn't it be possible to write Wayland in such a way that it is similar and familiar to Xorg, so porting Linux GUI applications is easy? Or is the API already

Wouldn't it be possible to write Wayland in such a way that it is similar and familiar to Xorg, so porting Linux GUI applications is easy? Or is the API already familiar enough that this is already possible? Surely it's possible to write a modern display stack while preserving the rich legacy of applications, toolkits, window managers. I would certainly like proper isolation of input, and better support for HiDPI and even locking. But I would certainly miss Xscreensaver and Fluxbox, and even random applications like Asunder or Suckless Terminal. Though I admit that I'm speaking from a position of ignorance, having only ever written in C/SDL for anything graphical on *nix. PS: Now the possibility of porting Fluxbox to Wayland is beckoning me. Could such a mad thing be attempted?