To be honest, I don't think it's going to be the Ubuntu community (or even the whole Linux desktop community) that's going to pressure nvidia to support wayland.
It's not the Ubuntu community that will convince Nvidia it's their large enterprise customers that want docs like "How to develop CUDA application on Linux (Ubuntu 18.04)". Nvidia can only use an ancient Ubuntu version as the baseline for so long before they get complains from large customers. Nvidia doesn't want to loose it's position as easy to develop for (compared to AMD's mess).
RHEL deprecated xorg, and in the same year we had the biggest wayland fixed in nvidia drivers