I find the idea that the Vinculum never wears down broken. You are supposed to get those from the big event, when you meet everyone from the same big region. Unless you botch half the time, by the end of the decade you are going to have Vinculum 10 with half the kindred in your country, and I think that's just ridiculous at this point. As I play it, it will never wear down enough to reach zero, but it WILL eventually decrease.