my worries around $10,000 BTC, and frankly any increase in value is this: why is it justified? What is BTC's unique use-case?

Everything it aims to do there are coins that are better at offering that. Peer-to-peer digital cash? Dash. Transaction speeds, low fees? Litecoin, or Dash.

Store of value? Ok sure, BTC is a proven secure store of value but litecoin is not much less proven, LTC has existed nearly as long.

I do think BTC has the first mover advantage but if they continue to fail in bringing forth innovation, while its competitors are constantly innovating, seems to me that one or another coin will take the throne of Bitcoin, someday.

Thoughts?