I mean, yes, keeping a project together has value, I just don't see where the assumption here comes from that this maintainer has to do that indefinitely or even has to be involved in actively searching for successors in a community they don't feel good about. The maintainer even states being open to suggestions. If nobody steps up, momentum can't have been that great, if somebody does, a fork will live on. That's still in the realm of mild inconvenience, other projects have survived much larger controversy.
edit: the frontpage is currently topped by a more balanced write-up by Steve Klabnik that weighs up, among others, both of these views https://news.ycombinator.com/item?id=22075076
Of course they don’t. But I don’t see why they couldn’t have made an issue along the lines of “I’m stepping down, I’d like someone else to take over the project”. (Still reading through the other writeup.)