I have only just started reading a little about BU. It seems to me that this is being blown out of proportion. Whichever party wins seems to just indicate the majority of the market will shift that direction, and whether BU takes over or BTC remains dominant won't really matter much.
For your rank and file bitcoin user, it won't actually represent any loss of value, it just seems to be a power play of the ultra rich. Even if hash power is concentrated in fewer hands, a 51% attack would still be prevented by simple self interest. Am I missing something?