It's main value lies in a mostly irreversible ledger of transactions, which in my opinion, has the potential to disrupt atleast some parts of global economics (online shops maybe). For international transfers, bitcoin is ahead of the current banking system (though banks are catching up in terms of fees and speed... or is bitcoin getting worse?)

On the other hand, bitcoin is also an interesting exercise in distributed consensus (though blockchain/PoW consensus is largely overhyped)

Other cryptocoins have improved on all these concepts or plan to develop them. Bitcoin might be remembered in the same way modern computer scientists remember the Turing Machine or the Zuse Z1.