I am a firm believer in do it yourselfing and a fan of cause and effect. IMO the best way for something to happen to the haven or halls/mines is to think up a plot and submit it to a DM. I have only heard of idea's on the outrageous side being revoked. Of course an idea that would alter the way of a domain would probably be on the outrageous side... only one way to find out though.
The elven haven and dwarven halls/mines have the potential for some amazing roleplaying - small and large scale. I agree with Shady Merchant that while change may be fun it is not worth all the work it would take unless the majority of players truly want it.
Maybe the reason people want the change is so the RP can come to them so to speak. I can count on one hand the number of times I have seen players try to do something 'big' with either place.
Once was when the Dwarfs attempted to sway King Moloch to their side. Obviously it did not work but those present would be able to tell you why
Another time was during the Shadowfey incident when elves were being lynched. I believe one character tried to rally the haven to action; which did not happen. If I recall correctly all the other elvish characters where against this idea so obviously things went the way they did.
That is just two examples of the few I can recall. Of course I have no way of knowing everytime someone attempts a plotline involving one or the other, but my best guess is that it does not happen often at all.
Sounds like this thread can be summed up as "These two places are boring, change them. Make them interesting." I disagree. I say that they are under-utilized and as players it is our job to make use of them. The DM's are more then busy. Take the time and think up a few idea's yourself and pass them on. If it is good and reasonable I have not yet met the DM who would turn it down.
On closing here is some food for thought. Still in recent memory is the shadowfey incidents where elves were lynched and brutalized. More recently threatening notes have been found in the woods around the Elven Haven which have the impression of being written by those of authority in Vallaki.. maybe guards.
An elven body has even been found near the haven with a note attached saying something to the extent of "We told you to stay away". There are PC's doing this and I am sure with more support something very very interesting could become of it.
Maybe the elven characters familiar to the haven could get together and do something about it. How about asking a DM if there is anyway a 'vote' could be held at the haven to replace the current leadership. I know one NPC elf who did not like Michael very much. Imagine if it was decided that he would now be the leader of the haven. Maybe he would turn if from Haven to Fort. Maybe he would ban any humans from entering - and ban any guards from coming in on pain of death. So many possibilities...
Of course this is just me ranting because I am at work. Suppose I will stop now.. maybe something in here sparked something though. I hope so; I would love to see it.