The incentive structure falls apart once Bitcoin original runs out of blocks to mine. That’s the starting point for this discussion. The only incentive to mine

The incentive structure falls apart once Bitcoin original runs out of blocks to mine. That’s the starting point for this discussion. The only incentive to mine then is to earn the transaction fee. These fees ($8) are currently orders of magnitude smaller than the mining reward of 6.25 coins ($125,000 at $20,000/coin). Either fees have to dramatically compensate by rising stratospherically or miners will depart for greener pastures. Yes, difficulty level drops eventually, but by then a large number of users have also followed miners off the network, in which case the price will drop too. As the price collapses, there will be a selling frenzy, further reducing the price. In this scenario, Bitcoin may settle to something as low as $10 per token. Once miners depart en masse, network resilience will drop precipitously. That makes it an attractive target for someone to stage a coordinated attack, which would destroy remaining residual trust in the network and bringing about the end of Bitcoin original.