This is solid economics iff you assume that crypto has a utility for which there is no substitute which does not share the same supply constraint feature, and even then its not solid economics for a current investment unless you also assume that that utility is the entire basis for its current valuation. Because even if it has a nonsubstitutable utility, if that's not the basis of its current value, then the "solid economics" is that there is some price it could reach from which further value drop because of supply (of substitutes) will not erode value, but there is no guarantee of what that level is.
This comment feels like it’s 2013 and there hasn’t been a decade of people creating thousands of other tokens and forks, or realizing that high volatility in liquidity or exchange rates is more of a problem than the levels of currency inflation we commonly see (the price increases we’ve seen for the last couple years are most of the inflation we’ve seen and that practice would be unaffected).
It especially misses the understanding that deflation is much worse for anyone who isn’t already rich. The model that anyone who bought a decade ago deserves to be fabulously rich is … unlikely to be popular with the rest of the world.
Crypto is an umbrella term for a number of solutions, including blockchains (roughly 1,000+ as of right now) and cryptocurrencies (roughly 22,000+). While a given blockchain may be limited in terms of how much can be 'mined' or grow, you or I could very easily create a new cryptocurrency or even a new blockchain. Assuming we got traction with it, there would now be N+1 more out there.
Gold is not something we can so easily create. It also has intrinsic value through practical applications.