Yes, BTC would survive as it did in the past already after big crashes. Many would see good oppurtunity to buy cheap coins instead.
I believe the mistake in this assumption is to project past situations into the future. There was a lot more uncertainty with BTC in the past and less competition.
In my view the only way that Bitcoin can suffer such a price drop is if the general consensus is that there is a massive flaw, be it technical nature or through the trading systems.
People wishing for such price drops generally say so because they want to
buy cheap coins and later sell them for profit.
If the value halves there will already be a lot of people seeing a potential doubling of their investment once prices recover.
The lower prices drop the more people will have to seriously doubt that bitcoin will ever reach its previous ATH again.
I am not saying that this is impossible but it is becoming less and less likely.
That and the fact that if people expect bitcoin to eventually reach an astronomic value it will
have to double ever so often for it to reach that value in a finite amount of time