Just suppose...
What if bitcoin seems to average about 7500 USD or so over a very long period, like a year or even more. Currently, this isn't high enough of a value in USD to really mine anymore with GPU's, if mining for profit in USD anyways. I do not mine with ASIC miners and I really know very little about them, even though I almost bought a Bitmain Antiminer S9 before I build my 8 GPU rig.
Will mining taper off to little to nothing, will difficulty levels be adjusted to compensate miners, or what else?
I would be interested to know some thinking on this, should it become a reality or even close to a reality for some length of time.
I don't think it's possible for Bitcoins to keep a stable price for a year, as we'll have seen it's very volatile and difficult to predict in which direction it's prices may go. However let's take a hypothetical situation, and assume it does happen then yes then the equilibrium mechanism will be in effect, for those miners mining during this period they'll be compensated more bitcoins to make up for their losses.