Hahaha. Bitmain would not dare. What it would start is a stronger debate for a POW change through a UAHF. But if Jihan Wu wants his mining cartel to die then no one is stopping him from killing it.
a POW change will only make Bitmain and Juhan Wu stronger and much richer than they are right now!
you think they give a shit if you make their current equipment useless? not at all because you are not only making
their equipment useless, you are making all ASICs useless. Bitmain will
happily start building new ASICs for the new algorithm and starts selling new equipment to miners that already had ASICs but now they can not use them anymore.
I believe you are overestimating Bitmain, and underestimating game theory's motion in Bitcoin. It would be the best for Jihan Wu to act for himself and for the good of the network than acting only for himself.
Plus heavy losses in Bitmain are coming because they have over-invested their Bitcoins in Bitcoin Cash, and they are hoping their IPO will bail them out, which might not be.
to be honest I wouldn't be surprised if some day Bitmain pushed for a PoW change! practically it will create demand for their products!
Tinfoil hat on. Hahaha.