In theory, this could be a very positive development for Bitcoin. A bit of hashrate diversification would reduce centralization risks and mitigate the chance of an 51% attack or selfish mining.
Maybe, if difficulty lowers a little bit, it's finally time for solar/wind powered mining?
(Some people say that a hashrate drop could even help to find a floor to the price, because as block times become longer there are less rewards paid per day, and thus less supply on the markets. But I have some doubts about that.)