Initiative: outsource vapi's into their projects
This makes much more sense, because then the people who write a library also maintain the bindings to it.
It also makes it the version of valac independent from a version of a library, because the bindings are shipped with it itself, and not vala.
There are very much bindings generated from gir, which can be moved to their project relatively simple.
Also maybe some very old bindings, like to gtk2 can be dropped.