The worst of all this is going to be the increased cost of manufacturing materials. Planned obsolescence (or built-in obsolescence) is another of the great problems that we live in this world, we want new and more powerful things every day and as always the end user will pay more for everything when buying a smartphone, a car or a Bitcoin miner. In the end, as @MrSpasybo says, we will have to mine Bitcoin with a laptop or with a Nokia 3310.