Wayland wasn’t the first attempt at replacing X. It has made more traction than any other attempt, though. There’s no real hurry - it’s not like X eats your babies and runs over your dog.
As far as robustness goes, that’s mostly the driver. I’ve yet to see a bulletproof display system, commercial or non-commercial. If you cut out driver issues, X is on par with or more stable than other systems. It had better be, given that it’s had decades of bug fixes with few new features to cause new bugs.