It is expected that many .worlders would just jump ship to another instance.

Why? Why wouldn’t they just consume the click bait content and shameless pandering propagated by the incoming owner, just like folks still on Twitter, Facebook, and Reddit?

For as long as one organization doesn’t control 60%+ of all user’s instances

You don’t need 60% of instances. You need the plurality of site content. That’s what the users are coming for.