As long as the hash rate is more than 0 and BTC/USD as well (which I think will always be the case), the Bitcoin network will reach another sort of equilibrium eventually. I'm not saying it'd go back up to current valuations or that it'd keep the same reputation among its followers, but I don't think the network will ever die (as in, the chain stops at a certain block for one year).
If the hash rate and BTC/USD became very low (on their way to the 0 you're mentioning), there'd quickly be an incentive for deep pockets (it's HN, so read "VCs") to start mining operations and create a new speculation wave they'd be well-positioned to benefit from.
If the hash rate and BTC/USD became very low (on their way to the 0 you're mentioning), there'd quickly be an incentive for deep pockets (it's HN, so read "VCs") to start mining operations and create a new speculation wave they'd be well-positioned to benefit from.