It's entirely possible for the rights holders to say "we're going private now" and pivot the project into a for-profit business.
In terms of future proofing against the project "going commercial" (i.e. changing the license going forward), it doesn't get much better than this, because pretty much all the copyright holders would need to agree on a license change.
Ideally, the bulk of the copyright does not reside with a small number of authors - the more authors, and the more evenly the copyright is spread among them, the better.
It's interesting because having a group of disparate humans come together and say "yea, we hate the current thing, let's build something better and not commercialize it" doesn't typically happen. Kudos to you folks!