Further centralization of mining
It is quite possible that mining may become more centralized. In the summer of 2016, the block reward will halve to 12.5 BTC; this development may move some of the smaller miners into an unprofitable territory; hence, forcing them to stop mining. As a result, the big miners may end up with a bigger overall percentage of the hashrate. Manufacturers of mining equipment constantly put out better, faster, and more efficient hardware. There is a consolidation happening in this space; thereby, creating larger mining entities. Quantum computing may also introduce a miner with enormous hash-power, and of course, if the BTC value, as measured against local currency, skyrockets, then it will encourage more investment into ...
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