Bitcoin's consensus is working as originally intended by Satoshi Nakamoto (miners vote with their hashing power).
Consistency of blockchain state within the protocol is an orthogonal concept to decisions to change the protocol, which only the token users have the power to decide. The miners are just the paid workers for the former activity. They have absolutely no power to change the protocol. For example, a 51% attack is not a change in the protocol.
BU does not actually mean unlimited block size. It means unlimited potential. Doing nothing hurts Bitcoin more than increasing the block size a little.
Afaik, there is nothing in BU's protocol which insures that the block size can only increase "a little". Your third quoted sentence above is
not even wrong.
You can't win them.
Well those who make the wrong decisions end up bankrupt. So let's hope we all get a chance to decide whether to hold BTU or BTC. Because I understand BTU is incompetent and its supporters don't understand blockchain technology.