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The innovation behind a blockchain-based system isn't the ledger or the distributed nature of the thing. It's the incentive structure behind proof-of-work that gives Bitcoins their value.

The non-zero value of the bitcoin network is the reason the blockchain exists, and it's the reason it can be used as a decentralized neutral third party for building apps. The blockchain "killer app" is money (Bitcoin).

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But that already exists. So what is all this other stuff?

That is the million BTC question. Bitcoin, on its own, could "change the world". Other blockchain apps could be influential even if the network/reach of Bitcoin stays at its current level. It's unclear which implementation (if any) will be the winner in the long run.

Not Invented Here in a nutshell.

Noone wants to buy Bitcoin to enrich those who came before them, so they'd rather setup their own version and sell it to others as "the next big thing"

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