I don't get it. It will actually be bad for BOTH chains if indeed Bitcoin forks into two. Some people who are following the space could see this as a weakness and another reason not to start investing or accepting BTC as payments. Imagine if you were a merchant and you have to go thru and be involved in this sh*t, with all the debates and the drama. And worst of all the uncertainty of BTC's future.
I don't see how it would be bad for BU at all no matter what happens because right now there is no "BU" coin and that will only happen after the fork. Once the fork happens, BU will carry a value. Right now it doesn't.
However the concern is very legitimate. Bitcoin price combined(BTC+BTU) will probably drop a bit after the fork happens, which is bad.
As you said, bitcoin's future is uncertain right now.... Would be nice if we could just get this over and done with.