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Alt coins that don't waste as much energy solve all the same problems. Bitcoin the first of a new breed, but that just means it's unlikely for the first implementation to win.

What property does Bitcoin have that doesn't have a more efficient solution?

Between proof-of-stake solutions and the traditional financial system, as far as I know Bitcoin doesn't solve anything more efficiently, from transaction processing rate to distributed consensus.

Proof-of-stake has many problems like nothing-at-stake problem etc.

> if you name some of the more efficient alternatives to bitcoin, I'll tell you which problems they're failing to solve.

This. Nothing except prof-of-work generates inherent value. All those other proof-ofs are flawed.