Im not sure about that dude, that will be happening when the price will be dumped back again but the majority of the newminers are mining ethereum and they can get very good money from the tx fees consider the ethereum users were paying a lot of money for the gas fees. It's not easy to fix the scalability problem on the running blockchain as it needs a very long process.
These new miners are not only aiming for the block reward dude. The income from securing the network is good enough right now.