I am not sure myself how much volume we can handle with a combination of Lightning & on-chain at the current block size, but I heavily advocate for keeping it as low as possible for as long as possible. Ordinals goes completely against this by effectively reducing the block space we can effectively use for transactions.
This is one part of the issue here, we don't seem to have a perfect agreement on how blocks should be, you want them to be as empty as possible, while I might want them to be as full as possible, I don't know about you, but sure thing is I could be biased as someone who mines bitcoin for a business, but I am pretty sure I am not alone in this.
Keep in mind that I am on a "moderate level of greed" compared to many other miners, most miners I know hate LN because they think it takes away from the fees which they could have otherwise collected, I have to always defend things like LN in front of most miners and try my best to explain to them that despite taking away from them, it's all done for a greater purpose, and should LN becomes mainstream, blocks will be full again and they would be making even more money.
I also try to tell them that it's best for us as miners that more people actually "BUY" bitcoin and not just transact it,LN users have to buy Bitcoin to start with, so the more users mean more buyers which essentially leads to a greater value, more rewards for miners and more security for everyone else, so basically, the more users the better for everyone, which is why I don't like to dismiss the rights of anyone who wants to use the blockchain in the way they like, you want to build a layer-2 system to allow people to make small transactions? I won't go against it, you want to hold some NFTs on the blockchain? I won't go against it, anything that brings more users/value to the system is going to be good for bitcoin as a whole.
It's roughly what's happening, I guess. Miners follow profit, but there is concern on whether short-term profit is greater than long-term, or if excessive fee rate is more desirable in the end. I can guess the miners don't care a lot about the long-term, but a mining expert can give us some better insight.
I wouldn't call myself a miner expert, but I have been mining for nearly 7 years now, starting from a small mine at home, to now having a 2MW farm, having managed a few extremely large farms, spoke with folks who own even larger farms, pools' owners, even with mining gears manufacturers, I can tell you that Phil's concern is valid.
It's hard to tell whether we look at short or long-term profit, but I would assume it's something in between, Phill's power deal forces him to always think ahead of the other miners like myself, he gets 50% of whatever he mines using x power (which is limited), and he needs to buy the gears, so he would probably do some medium range maths to decide whether to invest the next 20k in SHA256 or in Scrpyt, the calculation he does now, is probably going to be different from the one he makes 10 months from now when BTC's halving would be 2 months away.
So if his 20k is going to ROI in 3 years with SHA256, he will just go with another algo, regardless of whether or not he thinks that
BTC will stay there forever and Doge/LTC could die in 5 years.
I will be forced to follow the same logic that Phill's applies as we move further into more halvings, in fact, I face this dilemma every time I make a new purchase, I spend days with my partner trying to point that cash to the "perfect" algo, we both agree that
BTC has more future chances of survival then LTC or Doge, but when it's 2 year ROI vs 8 months ROI for the same amount of power, you will seem to focus more on the short-term than not.
As the rewards shrink in value, the difference between mining BTC and other coins could be even greater than now, to the point where most miners would start looking at short-term as opposed to long-term, and there are only 2 things to stop money from going into those coins and to keep it flowing to secure BTC.
1- Increase rewards (you can't do that with the block rewards, can't play with the max supply) so it MUST come from fees.
2- BTC's fiat value has to grow a lot more than the other coins to offset the ROI difference.
No.2 is more difficult to happen since those coins have a much lower market cap than BTC and it's easier to increase their value than BTC, the good thing however, it's also a lot easier to bring their profitability down since their hashrate is a lot lower than on BTC when translated to value > hashrate.