I can see that getting out of hand. Remember those strange screenshots threads where there was coup on coup with a dozen pretenders claiming the throne in a row.The example I want to talk about is War of the Roses for England. At any point of time, before 1500, if England lacks an heir, then the chain for War of the Roses can start, which creates a lot of interesting situations for the player, as well as giving unique historical immersion.
Be sure that it doesn't expand into a giant spamming of rebels and pretenders.