But the answer to finding yourself being load-bearing is not to start using AI code with AI tests.
The Great Man theory of open source development, where it all hinges on one heroic individual, has always been a fatal weakness. It happens because the companies benefiting from the software just will not pay the individual guys who let their company work. So the companies try to make the guys feel obligated to do work for them for free.
Those guys have to start saying “no.” Go sailing. Declare the project closed and see if the beneficiaries will finally contribute. Maybe they will, maybe they won’t. But no company will put in the developers or money for this stuff to be done until you say “no”.
You heard it from the Ray-Guns first, but apparently you need to hear it again: "Just say no!"