I think actually in the enxt years we will reach the climax of mining. Actually there are so many miners. And they are even more ACIS and and asic producers. Its like a mining war. So many hashpower and so many electricity used for the cryptocurrency network. So it will not take to long untill the whole mining system will collapse. Because everyday its less profit with mining. And they are also new coins who all work with proof of stake which will replace the mining system!