Why do you need 8 billion utxos? Do you feel that every single person and country in the world will hold or use Bitcoin?

To me, there is exactly zero chance of that. There are currently around 180 fiat currencies. Plus gold, silver, shells, cigs, Bitcoin other crypto, stablecoins, whatever...

I'm bullish as hell, but there is absolutely zero chance everyone on the planet at any time will all use the same money at the same time.