Why is anyone even still talking about this? Big blockers who wanted centralized garbage altcoins got their trash coins BCH and then BSV years ago and both failed miserably, and nobody cares about them. Bitcoin meanwhile, is the most secure network in human history and is growing into the world's store of value and eventually the world's alternate currency, something it wouldn't be able to do if it went with big blocks and therefore compromised the very thing that makes it valuable and unique.

Also Bitcoin's security model is fine. Energy use on Bitcoin will probably peak at some point and then fall a bit to long term equilibrium. Which is fine because that level will likely be much higher than it is today and already today the hash power of bitcoin mining is a huge amount that could never be duplicated by any attackers. Even as the reward subsidy dwindles it'll be fine. The price of transactions will no longer be a cheap $1 or whatever but that's okay because doing on-chain transactions will be sort of like wiring money is today, something you don't do very often. On-chain will be just for large transactions where the tx fee is entirely negligible, or moving money around, while everything else will be done on Lightning or possibly other later developed L2's where you pay like a penny for a transaction. So it'll be alright for users. And for miners it'll be fine because by then miners will almost entirely be using either essentially free stranded energy (startup cost but then extremely low maintenance cost for renewable energy) or they will be mining companies who are tied directly into power plants (which is already being done today) to strengthen the energy infrastructure of society while also getting super cheap energy for mining. Any miners not doing these things, like those that are actually paying for energy through providers on-grid, will have been kicked out of the mining business due to costs.

Basically, as the mining rewards gradually over the decades become mostly from tx fees, it just means the mining industry will get far more efficient. Those who don't won't be able to mine anymore. And the mining industry will move entirely to operating directly at the sources of energy, instead of being end users of power, which will actually be better for society in an additional way because no longer will we hear stories of miners eating up the electricity of some random town. As in all things related to Bitcoin mining, an equilibrium will be reached where the economic cost of mining will be a bit lower than the economic reward for mining, and it'll still be plenty enough for Bitcoin to be globally secure, the most secure network in the world.