My understanding of it (and IANAL) is that while the board could potentially vote to change it, the shareholders can take legal action for failing to pursue the public benefit obligations. I can't say whether trying to remove the public benefit obligation alone is grounds to bring a suit, but I think they'd be able to make a case for it. My hope is that being a PBC will scare off predators and encourage like-minded people from day 1, leading us to a point where a future board is made up of people who are 100% committed to the mission from the start.

That's a long way of saying what you said: I want it to protect against future enshittification. I want it to work.