A newly created open source project coded using AI would be fine if the creators could prove that they understand how to maintain the project and keep it going beyond the initially promoted code and that kind of proof can only come with time.

Prove to whom, and why? Who entitles anyone to demand “proof of investment” for a piece of work they have zero contribution to?

The big problem is the sheer volume of low quality projects that get abandoned will cause the projects that actually have potential to become needles in haystacks.

They already are. I don’t have numbers, but pretty sure the ratio between useful and useless repos on github is… Not high