How is it clear? Ten years on there are zero cryptocurrencies in wide use as actual currencies, and blockchain has drastically changed zero industries (except maybe malware).
The Internet had many popular use cases years or decades before investor money poured in. Blockchain has already seen a bubble and a bust with exactly one popular use case: trading cryptocurrency, which itself is only really used for speculation and scams.
"Managed by code" is also not really a thing. Humans write the code! And there's no real reason to expect the humans who create the cryptocurrency ecosystem to be any more trustworthy than the humans in government.