Maybe this is blind optimism, but I don't see significant cause for concern. No sizable producing organizations have folded, save for a few incubators.
Sure there are financial woes and some poor leadership examples: at least one significant nonprofit not mentioned here has a new-ish leadership team that, paired with money troubles, had a disastrous production process for an Off-B musical that has artists putting on a good face publicly, while privately telling people to never to work there again...but despite poor reviews the show's selling tickets.
What this piece doesn't touch on is the prominence of Enhancement money, where commercial producers develop a show, then subsidize a nonprofit production (usually well over a million) to premiere and develop it for future commercial life (see: Hells Kitchen, Wholesale, Buena Vista, A Strange Loop, Newsies, everything at ART, etc). Some nonprofits can't produce a musical without enhancement (this isn't a new thing post-pandemic); it puts another decision-maker in the room for a nonprofit; enhancement costs have skyrocketed post-pandemic; and, anecdotally, it seems like a greater number of shows are dying after their initial nonprofit runs.
Would have loved to hear from the labor union side, too. I'm sure Equity and others still feel that Off-Broadway is getting away with murder (because any contract offering people less than $1,000 a week in New York City of all places basically caters those who can afford to take a vanity prioject).
As previously discussed, things are much more dire for regionals.