As I said earlier one of the issues here is that they currently presumably have a group of employees who know the company's systems, know each other and can work together effectively, and know the game system that they are working on (and probably helped to develop it).
That's not expertise that is ultimately irreplaceable, but it is not easily replacable. There might be a lot of people who are willing to do the job, but identifying people who can do the job well is often not easy, new staff need training, and the more current expertise is lost, the bigger the problems down the road.
A company with a huge cushion in cash and profit could probably afford to dump 70% of it's staff and recover, but Paizo? I'm very sceptical that they're in such a position. Especially as a serious fan backlash (if not from bad publicity, then from a drop in quality that would likely result from such a turnover) could well send them into a downward spiral that they would never really recover from.
My impression of Paizo, in the current market with 5e dominance, is that they probably have to fight really hard to hold onto what they have, and if they lose ground it would be hard to get it back.