Most shit pins probably have few miners, and are pretty susceptible to market manipulation. I large influx of miners across the market could dramatically change the price.

Also, many miners are already using software that automatically changes their hardware to target whatever coin has the most profitability. It’s expected that this will continue just without ETH

The profitability of a GPU miner has dropped by about 2/3 with this overnight. So it remains to be seen where they actually go.