I could see a time when most/many are using bitcoin as primarily a SOV with few onchain transactions. Lighting for low fee transactions is the primary MOE. Hash rate could fall considerably as miners unplug. Transaction finality can still be secure with a responsively resistant fee market - hash comes back on-line when demand spikes, which causes fees to spike. When fees are low and hash is low, one could always wait longer than six blocks for transaction finality. Censoring high fee transactions has opportunity cost. Spamming/scamming in the setting of high fees is costly overtime - they eventually run dry.