How long is crypto will survive in this world ?
What could kill Crypto?
In my opinion crypto will exist while Internet does, as we know it.
So only global cataclysm, like huge sun flare, may ruin nowadays networks, including blockchains.
Cryptocurrency is dependent on internet. So it is highly probable that what would happen with internet has direct effect on cryptocurrency and btc in particular. But I think that would be a small probability to happen. And bitcoin still has a long way to survive in the future.