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I don't see your logic. Bitcoin can't be killed by lightning network, which runs on top of the main net. Even if you support BCH over BTC, numerous cryptos (XMR, XRP, LTC) do the same things, and more, than BCH.

The competition to become the benchmark of crypto market is already owned by BTC and it will be very complicated to reverse it back. BCH could be recognized as the original Bitcoin code by organisations and institutions. Nevertheless BTC will stay for many the original Bitcoin vision which is to be a protocol layer for exchanging trustless value and not only digital currency.

The time will show us which one is legitimate