The medium-of-exchange ship appears to have sailed for Bitcoin.

Bitcoin is a store of value, and this is how the story ends most likely. Yes there will be some niche medium-of-exchange use, and performative spend here and there (including nostr zaps), but for the most part Bitcoin will be bought and sold between those looking to hold it and those looking to cash out on their holdings.

To those saying it can be both the ultimate medium of exchange and store of value at once, that's simply the middle character in the IQ curve meme. You can't encourage people to stack and unstack at the same time.

I think the future of the lightning network and cashu are both bright, but as transport for stablecoins, which are coins that your average person will actually spend at the store.