Yes but my point is it doesn’t matter what the fee is in btc. If the fee would still be 0.000030BTC in 2121 but the fee alone if worth 100$ then you would not be willing to pay that. So it only matters what the fee is in $.
I think it also depends on a geographical standpoint on where the mining business resides. Obviously, if the mining equipments are placed on a cooler and breezy environment, that would reduce pollution and energy consumption. Now, for the fees, mining will always be on demand due to the number of transactions that take place everyday. Even if the prices of BTC skyrocket in the near future, lower and lower denominations of BTC would be required but its amount would be equal to around a couple hundred of $$$.
I remember there was this mining company where they placed their equipments on a mountain in order to reduce the heat garnering from the equipments.