Destruction of Bitcoin via tanking the price wouldn't necessarily kill Bitcoin. It could *potentially* drive up its use, as merchants may see devalued Bitcoin as far more valuable long term. They'd receive more Bitcoin for their products, and hold onto their funds long-term with the hope of a price recorrection. Such a recorrection isn't too far fetched as whenever the price drastically drops, volume will go stagnant for a while, then spike when the price stabilizes. Due to the uncontrolled inflation rate of the currency, in nature people will pay what they believe it is worth. That's the nature of decentralization.

If the value crash destroyed moral in the Bitcoin community, either a Bitcoin 2.0 will emurge, or we will all switch to one of the 20+ popular altcoins. Switching to a new currency would take time, but after one is determined to be "the next Bitcoin," it's volume would skyrocket, directly causing its value to as well.