You are totally free to work on whatever you want to. You don't have to use the software that the Wayland devs (and other developers that like Wayland) produces. You can use and code whatever you want.
So you've managed to get redhat to commit to continue to package an X server, then? I'm impressed by this achievement and send my thanks for your efforts - they've been trying to drop it for a while now, it's only wayland's continuing status as unusable vapourware that stops them.
You accept money to work on Red Hat products, that is a choice you make. The owner/manager of the company you work at is free to decide what systems to use and then pay people to carry out her strategy/direction. You probably don't get to decide what kind of office chairs you buy either.