There are tons of things the society could do without and be better off. Or maybe not, who decides? Surely it shouldn't be majority as then we will approach Idiocracy level of civilization in no time with Kayne designer flip-flops getting a yay and NASA or a new semi-conductor start-up getting a may.
I think there are two problems with crypto currencies:
1) Pollution and carbon emission is not taxed but should be.
2) Regulators allowing the situation where magic token is the only way to do certain kind of trades while competition faces insurmountable mountain of regulation and requirements. If it was possible to make fast money transfer system without hiring the army of lawyers in every country you want to operate then BTC would never gain any traction.