As you can see on https://www.f2pool.com/coins https://www.f2pool.com/coins other coins using SHA256 as PoW algorithm only amount to about 1% of Bitcoin's daily

As you can see on https://www.f2pool.com/coins https://www.f2pool.com/coins other coins using SHA256 as PoW algorithm only amount to about 1% of Bitcoin's daily dollars of Pow Produced, so if any nontrivial amount of hash moves there, then those will soon become unprofitable too.