If BCH succeeds in killing BTC, then:
1) There will be a general crash in crypto because it will be proved that they can be killed by such attacks; and
2) There are many better coins than BCH to play with.
Nonsense. If the market moves strongly to Bitcoin Cash over Bitcoin Core, then the narrative that 'Bitcoin Cash is The Real Bitcoin' will have been proven true.
That's just not how it's gonna work. Bitcoin is whatever the bitcoin wallets accept. Which is segwit, like it or not. The other one is stuck in alt status and will continue to be so.
Continual improvements to the tech was always part of the plan. Segwit it is for this round. Just how it is.
Thats exactly how I see it.