The blockchain is an excellent distributed storage system for anything that should be immutable, such as contract hashes like notarial deeds, vehicle sales, and digital identities, which are not controlled by any central authority (if the blockchain is truly distributed) and are verifiable and tamper-proof. NFTs are the toy experiment that demonstrates this path.

It is therefore also usable as a currency, with fungible tokens, where the transactions per second (TPS) are sufficiently high, not for Bitcoin, therefore, but for example, Solana is already adequate; its performance and economic model are sufficient to pay for your local café.

That, without widespread acceptance, they have limited use, initially for crime, then for speculation, is another matter, but it is not a technical issue. The technical issues are quite different: https://blog.dshr.org/2025/09/the-gaslit-asset-class.html