Bitcoin can’t go to zero because like 10% the supply is lost in some dude’s old Dell from 2013 and those coins ain’t ever hitting the market again. So the rest of us are basically passing around the only sats that are left, and someone’s always going to need it to escape inflation, that’s worth something; to someone, somewhere.
You can’t have $0 Bitcoin when some Chad from Omaha is still stacking $5 a week.