I think Bitcoin will be the currency of an interplanetary humanity. And I don't even own any bitcoins or think it will continue going up in the next years. But technically, blockchains will be key as store of data in the (distant) future.
Blockchains don't need to be a currency, we've already got git, it's much less computationally intensive.
If you're using the bitcoin consensus approach in an interplanetary era, you quickly end up with using the full output of Dyson swarm just to stop someone else doing the same, not for any real gain over "I trust you to keep this ledger correct because we all know what 'accountants' and 'lawsuits' are".
"Talking about" is relatively easy for all four; but IMO the use of accountants and lawsuits is much more likely than people using Bitcoin and JavaScript.
If we don't have lawsuits, there's no process by which someone's failure to have an accountant could be held against them. If you don't have something accountant-shaped that can examine the real world, then you have no way to audit that your debit of 100 Martian Pesos was balanced with a credit of 100 traditional Martian didgeridoos, no matter if the Martian Peso was a cryptocurrency, a fiat currency, or commodity money consisting of transmuted post-transuranic-island-of-stability-metal. If you don't care about that, you're probably only playing with money and assets anyway and are functionally post-scarcity.
We might be post-scarcity, annihilated, or post-apocalyptic in 100 years, but none of these three would likely keep Bitcoin, and only one JavaScript.
Bitcoin is absolute crap for interplanetary use. Delay to Mars is between 3 and 22 minutes. So at worst you would have 2 blocks in between. Have fun with double spends. Or distributing the mining...
Expand to other solar system and it will get worse still.
