That means that X case will become increasingly broken. It won't work and won't be supported, newer hardware or not. And X won't have parity for hardware featu

That means that X case will become increasingly broken. It won't work and won't be supported, newer hardware or not. And X won't have parity for hardware features anyway. Like HDR - it will be Wayland only. And so on and so forth. So X is fried on all ends in the long term. It's not that it's not possible to use kernel interfaces - it's just no one will bother putting an effort in developing X. It's already happening.