Tribes Stability
I'm playing in a multiplayer game as a tribe and having no problem with the event. In fact, I've unified the tribes and formed Gaul. Yes, it is a pain every once in a while, but as long as you make sure each family has someone assigned to a position you should be fine. If you lose a stab point, you have to lay low for a while and make a sacrafice. Pay close attention to when a clan leader dies because a new family's leader will often replace him, and you will need to make that clan happy. Use the "employed" tab of your character listing to help you make sure you have someone employed from every clan.
In my opinion, dealing with a monarchy or senate is just as difficult, and requires the same amount of care.