Why would people who pre-ordered miners and waited months ever stop mining considering how quickly their device's lifetime coin generation will drop off as other's asics are delivered though?
Why would they run them when they cost more in power to run than they yield in coin? No matter how many months you waited for it, it's not going to be super fun to run when every moment you have it running costs you money. Might was well turn it off and buy some coins for less.
Mining is only a small part of the market supply, we've _never_ seen evidence of price following difficulty, only the opposite. As time goes on less and less of coin supply is being freshly mined things may turn out differently than they were in the past, but I wouldn't expect it.