I use Wayland KDE daily with Nvidia. It's not the most polished experience but it's far from 'no chance'. The only problems I've experienced are YouTube download gui not working, task bar randomly freezing (which isn't an Nvidia specific issue according to the kde issue tracker comments), visual glitches on kde panels with blurred backgrounds and the computer not waking up from sleep (didn't try troubleshooting or running x so might be solvable).
Edit: Remembered more things unrelated to Wayland but might be related to Nvidia. Kde system monitor reads all nvidia gpu data as 0 even though it shows up correctly in nvtop. And all ttys except the default are outputed from the igpu which makes troubleshooting annoying.