Not to detract from your point but Y2K was a very real threat - albeit likely not to things like nuclear weapons or planes as was often reported, but to every day software that was beginning to run the world - and it was only not a problem bc thousands of engineers worked like hell to fix it ahead of time. I only like to mention it because it's somewhat hopeful, like dealing with the ozone layer. We can in fact take collective action to fix problems.
Anyway Google "2038 problem" if you wanna get in on the ground floor of grifting for the next one
Frankly no.
I have said for years and will continue saying, it's actually just not that useful, especially for the amount of wasted compute (which embodies electricity and water, in turn embodying fossil fuels and exploitative extraction, in turn embodying pollution and greenhouse gases, etc.). In order for a cryptocurrency to have meaningful privacy and resilience guarantees, it must be proof-of-work (proof-of-stake is horseshit, just a way for the wealthy to control the ledger again). In order for it to be widely used, that work must be performed at scale, leading back to the previous concern of wasted compute. If you relax the privacy and "decentralization" features to relax that compute - what exactly are we left with? A currency that behaves like any other except it is not state-backed and you don't have to install venmo or zelle or whatever new start-up forms to facilitate moving money from one place to another without being taxed.
And I have not even bothered itemizing how those privacy and decentralization "features" are, frankly, worthless. Every transaction taking place inside a computer is traceable with enough time and energy. Some might require nation-state level resources to do that tracing, but the fact remains. If this is to be used for some grand "free" future, a dual financial system where the hand of the state is stayed, it fails at that purpose. In terms of preventing fraud, preventing abuse - these systems are also made by humans. All of the math in the world cannot stop someone being handed a $100 bill and being told to leave a backdoor in some validation algorithm. All the cryptographic guarantees do not stop someone slapping the wrong label on a box. Do not let the techbros convince you that math somehow fixes these human interactions - do not let them convince you that economic relations are not, in fact, social relations.
Cryptocurrency invents a world that does not exist, and prescribes a solution to the problems of that world.