The topic of the Rust experiment was just discussed at the annual Maintainers Summit. The consensus among the assembled developers is that Rust in the kernel is no longer experimental — it is now a core part of the kernel and is here to stay. So the “experimental” tag will be coming off. Congratulations are in order for all of the Rust for Linux team.
If i remeber correctly, the current approach is each device/vendor family is free to choose how they want to move. for example, gpu folks are actually interested to do rust stuff (for example novo, tyr by redhat,collabora). there may be some families who do not want to move fast.