If they decide to fork, then the block production rate on the government chain would fall to 75% while the minority chain is at 25%.
But that would happen "instantly" until the 75% of delegates would vote for more corrupted backup witnesses ... At least it is now possible with the power the majority of witnesses have... So SP distribution must first get distributed more equal until the written scenario could be realistic ... no ?
PS and how can you prevent that the majority of stake will not be controlled from a minority in the future? Th current elite group for example... they have infinite money to get the majority of steem stake, bitcoin stake and so on....