I think assuming a writer had your best intentions in mind has been unwise for quite some time. Murdoch built an empire exploiting this assumption.
We still need some mechanism for determining which humans have enough long-term commitment to become maintainers. Source contributions are no longer a reliable signal for that, and I don't know what future signal we'll use going forward. That's going to be a hard problem.
But, who knows, if AI really does make programmers radically more productive, maybe successful open source projects don't need a large maintainer team.