Miners are motivated by simple profit calculation, not R&D into energy generation. R&D has an unbounded capital risk, while bitcoin is a (relatively simple) statistical calculation of energy-cost which is a bounded cost (at any given time, within a range). Not a single bitcoin MINER is "greatly incentivized to further decrease power cost".

There are industries in much better positions to revolutionize energy production than bitcoin miners. In fact, there basically a single industry that doesn't have this incentive.