> As soon as some graphics toolkit decides that supporting both X11 and Wayland is 'too hard' you no longer have the option.
Like I said before:
If X11 networking is valuable then desktop programmers and users will continue to insist on it's usage.
Claiming that having the _option_ to not use X11 will lead to it's demise on the Linux desktop is effectively just admitting that the majority of people not only do not really on X's features, but would actually try to avoid using it because better alternatives exist for programming GUI applications.
The way I look at it is that X11 networking is inadequate at a best and if people would like to see it's continued existence then it's up to the X folks to make it more attractive then it's competition.
In addition to that due to it's API agnostic nature Wayland can actually facilitate the usage of a 'Improved X' then the current X Server-as-display-manager approach to things. However, honestly, I think that in the long term a improved X is not going to appear and people will use other methods for their remote desktop/application needs.