You are throwing away the possibility that there is an intrinsic value in Bitcoin, more related to socio-economic-political concerns, than survival. There is not only one domain in life.
An incorruptible ledger resistant to the control of any individual, corporation, or state. Bitcoin may fail in its implementation of this goal. The future is still to be determined.
Bitcoin's underlying technology creates the possibility of decentralized governance, starting with currency, which is the connecting link between actors in societies based on economy.
Why such a future might be beneficial to mankind is that banking and finance being controlled by a few has led to errors with systemic consequences.
See the 2008 financial crisis and hyperinflation in Venezuela and Zimbabwe. See the seizure of funds by governments from individuals in Greek and Cyprus, scenarios where many of the affected did not write their own doom (others wrote it for them).
Because it being the first successful implementation...it has 9 years of history at this point. It has proven itself resilient to hacks, ddos, Chinese bans, threats of regulation, exchange scandals, and bad press, and yet the protocol just keeps humming along. It being the first, all other cryptos are traded in terms of BTC. The network effect, and the mind share of BTC are substantial at this point. BTC has one largely fixable problem: it doesn't scale. Lightning network tests prove that it can if a second layer is added. Once this rolls out, the game will change.