Let me know when one pool gets above 40% again.
It's 2 pools, one with 10's of 1000's of independent miners.
But also a month ago the stock listed 14 miners had 26.6% of the hashrate, one cycle ago they didn't have even 10%, and they added 17EH/s in one month, they are growing faster than anything else, Marathon has already bought 35Exashash of gear, at current rates 5% of the total.
At 4 cents per th/s there is no way smaller miners will be able to compete in any fashion that it matters, and hobby miners are already done for.
While it might not be as bad as ETH, it won't get better either!
If any bitcoin miner is no more making profit from bitcoin mining, they should stop mining so that the money earned by miners will be sufficient for the remaining miners. The hash rate will reduce but not to the extent that it will have negative effect on bitcoin blockchain security.
If miners drop then not only does it mean a lower hash rate needed to attack but also cheaper gear available to be bought for and datacenters without a client. so ready available power, Bitmain sells their latest miners for $20-25, used miners go for $5 per th/s, suddenly the security is down to a quarter in $. The last thing needed is some top miners going bankrupt and available to buy alongside their gear at scrap-level prices.