I'm glad to know you guys are aware of the issue. I'm over 30 years into my first game, I control four daimyo districts and most of a fifth as well. I have no one in office and no one to select from and this has been the case for over 10 years game time. I have half a dozen vassals of which two are sons and three of which are children and my game has come to a stop now because if I conquer any more districts my never increasing 5/5 territory limit will be breached. Additionally, I've never been able to recruit ronin either and cant even try anymore because as I said I have no one in office - any office for years. I really wanted to do a nice AAR for the CKII beta key giveaway but it seems that wont be possible now.
On a side note, what is up with the attributes system? Most of the people I had to select from were inbred, lisped, insane paranoid types with very low stats. The same goes for brides for my characters. Something seems out of whack to be sure. The highest stat character I remember seeing in the game so far was one with two 11 and an 10 value and that person had three negative attributes but I digress...