Because no one is using Bitcoin as much. We see every time there is even modest increase in use Bitcoin fees blast off. If you expect everyone to be paying super cheap fees offchain, then how is that different from Monero in that regard? Miners will be making much less money in fees because users are not paying higher onchain fees (isnt that Bitcoins security model for when block rewards vanish is higher fees?)
Guess we'll have to wait and see what happens.
https://nostrcheck.me/media/af740d198babb8c7b82d0a4718eb354bb3f6af9a98639b85d4a5cf1371caba85/9f76e4c0f830601c97c152d2b5336ab3a18630c758d0a4ae48b454c08199af30.webp