I see two possible outcomes. If (almost) everybody agrees before the fork that BU is the way to go, then it will become BTC and the Core chain will die.
If we can't agree and the fork occurs i see no other way then BTC and BTU, even if BTU will be far larger. A switch back to BTC or XBT (which might be more correct) later on seems possible, but only if the core chain will die.
Of course there is also the possibility that there will be no fork or that BU will remain a small altcoin after the split, because after the split it is up to the users which chain they use. If most of them want to stay with core this will have an effect on price.

I really can't believe that in 2017 these are the kind of threads we should see here on bitcointalk.
 

Let us take the principle of Occam's razor. Most likely, the miners here have a different motivation than simply chopping the reward for the block and commission. Those who now support the division are most likely stupidly paid for by the Fiat.
The capacities of the asics are bought out bluntly, and for more money than they can bring later for mining.
Probably they were promised even more millions of fiat USD for a split.
Imagine how much money can stand behind these monsters. All sorts of bankers, intelligence and so on.
In fact, they have an unlimited resource!
The same Roger Ver had spent enough time in prison, so he was hooked to the American security forces.
If you think that there is no such thing, then you are very wrong.

And the goal of the campaign is not at all to get the "improved" used and earn more ......