If miners stop playing stupid games and really want the best for bitcoin, they would stop stomping on the hardfork drums of war, and they would activate BIP141 as they have been told by everyone worth listening to in the space. But what happens when you give stupid janitors the ability to vote on engineering matters? that they will don't do the right thing.
Enable segwit with no stupid hardfork drama, and see bitcoin skyrocket.
Break bitcoin in half, see the price crash, and see everyone involved in the forked chain going bankrupt, with the price going to 0 on Forkcoin, and with Bitcoin crashing but going back 3 years in price and taking another 3 years to recover.
Your choice.
I agree with you on some points that all miners should adopt and vote for the activation of segwit and will not bring another issue of activating hardfork. If all miners will agree then we will have a fast confirmation of transactions as well as the increasing value of bitcoin. But I will also disagree with one thing, its about the bitcoin split. When bitcoin will split it will not go bankrupt, the value maybe deflate since users will be divided in two groups. But even if bitcoins value will drop due to bitcoin split but it will still recover like in the case of Ethereum and Ethereum Classic.