This work is funded by Google and I believe others. So that’s a positive signal towards maintainability. Regardless of a specific person being involved or not, Google has significant Rust components in Android and a vested interest in all this.
But also on some level, it’s too early for these questions. Stuff is still an experiment. It could all get removed tomorrow. Once it’s closer to being permanent, then “how do we continue to maintain this” becomes a more important question.