Excellent point, but do me one favor, someone who's happy to do math right now, what difficulty is justified by a $110 price? If 1 trillion diff corresponds to $42k price for BTC, what BTC price of $110 corresponds to which diff?
That should give us the end-point of difficulty leveling off and should also tell us roughly when to expect that to finish levelling.
Even if someone were to do the math, it wouldn't be accurate as everyone is Pre-Ordering and will end up holding the bag well after it has stopped being profitable. If you could only buy immediately available hardware, then an accurate assessment could be made.