more mining--->more sell pressure on btc---->>more difficulty--->more electricity cost----->no Return of Invest----> and shut down with negative profit ----> sell miners HW under pruduction's (or buy) cost ---> underinvested miners win and worst ( assume this word widely ) HW producers and big farms lost

cicle will repeat when people will (and they will) buy equipement for double (or more) the production's cost, probably because the next price's bubble

the cicle won't repeat when speculators understand that high ROI in bitcoin world is allowed only for very shot timeframe and at a huge risk.

However I don't think the time for true difficulty drop is now