Nakamoto said: "the price of any commodity tends to gravitate towards the production cost"(or something like it)
Since the sub 200 trip caused great concerns about whether mining would be profitable and what would happens if lots of miners shut down to cut losses, I think we already visited the bottom
If lots of miners shut down the difficulty drops making it cheaper to mine, so the production cost can go down, it's not fixed.
but would take some good time before everything get back to normal, what would cause slow confirmations, mayhem and havoc all of BTC world.
Changes might be possible, but would cause too much pain to count that they would happen without big resistances