The moment forking becomes a norm ASIC manufacturers will change the tactics that will make changing the algo pointless. Not many realized it still but TSMC 7nm node is opening a huge room for improvisations for the hardware engineers and designers compared to 16nm nodes. So the hardware limitations will became less relevant for the engineers and if a company is looking after the profit they can achieve it. Crypto market is still blooming so the profits in long term will be astronomical. I'm not pro ASIC but we cant rule out the progress these companies will make, just a reminder.