1) Wait for Jihan Wu to create BUcoin by hard fork
2) Exchanges list BUcoin
3) Users dump BUcoin for BTC because the best devs are the Core devs and all merchants support Core+segwit
4) Jihan Wu goes back to BTC accepting defeat or stays mining useless marginal coin (just like the ETC miners)
5) Enjoy doubled BTC
you are making an idiotic assumption.
if Wu hard forks now, he has hard forked
shit that nobody wants, and yeah your bitcoin would be doubled but you would own bitcoin on current chain worth ~$1200 and would own bitcoin on
WuChain worth $0.however if Wu and the rest of the hashrate and then afterwards (the next step) the rest of the nodes show they want that fork, bitcoin will fork and you will own bitcoin on only one chain that everyone switched to and be worth $1200 and there won't be any other chain unless you and a couple of others run the old chain.
and the same goes for any other fork.
for example if SegWit forks now with ~20-30% it would be
shit that nobody wants. and if it forks
with majority then there will be no other chain so you can have bitcoin on! again unless you and a couple of others run the old or other chains and have coins worth $0 there.
change the word SegWit, BU, ... to anything you like and you get the same answer.
TLDR:
fork without majority (consensus) : you end up with useless forked chain.
fork with majority (consensus) : you end up with one single chain without leftover