It will be interesting to see how this develops. However 'in theory' the whole mining profitability issue should always find a state of equilibrium. If it becomes unprofitable to everyone then the hashrate will drop, the difficulty will drop and thus profitability goes up. Bitcoin value can also increase to increase profitability, but of course manufacturers set pricing of hardware accordingly, so margins will always be tight to end users. I don't really see it will increase the adoption of alternative currencies such as Bitcoin Cash, the automatic balance of profitability applies to all POW cryptos.