Having played trough half the campaign on Knossos, there a few things I noticed that trigger my tism - and that is the enemies you can fight.
While constantly fighting shivans can be boring and it's fine to want something else, that something else should be credible.
Mercenaries or a megacorp going to open war against the GTVA? That makes zero sense. How will the company or merc operate when their homes, logistic, families are all living under the GTVA?
If there were multiple power blocks and those mercs or companies operated from a different one, then it could work....maaaaybe. Even then the power could just demand the other power do something about it. A mercenary company from China declaring war on the US would not really survive.
In other words, no one would betray the GTVA and draw a big target on their back unless there's a VERY good reason for it or they believe they could REASONABLY get away with it.
