satoshi would say no to BU. he knows more than anyone else, he knows this will happen later which is why he already expresses his opinion back then. but for the profit that these exchanges are ready to grab, they did split it on their own to which you now can buy BU. so all you guys who wants to buy cheap and honestly waiting for BTC to dip down to a hundred, go buy BU now on exchanges, save it. its yours!
We don't know what satoshi would say, so stop putting words in his mouth.
What is almost certain at this point that even if Satoshi would reveal himself and voice his opinion, current war camps - SegWit and Core wouldn't listen to him.
The fact that we have no higher authority to appeal to might be a positive too. After all Satoshi wouldn't be around forever anyway to fix our problems.