Everything looks fine till this part:
If miners start to unplug hardware and the block finding rate falls then some of this pressure will also reduce because fewer coins will be being mined each day.
There's only 1 scenario where block finding will fall, (correct me if im wrong)
High hashrate -> lots of miners disconnect -> waiting for the difficulty adjustment -> blocks stop being found as fast -> difficulty adjusted -> blocks are more likely to be found with the current hashrate.
Thus this is going to give a 10 minute average per block as we want, this means that the hasrate upward or downward does not matter in the long rune because the difficulty adjustment will settle in to have a steady rate of blocks being found per 10 minutes.
Miners will typically not all shut down at the same time so this will be somewhat gradual, probably over a number of difficulty windows. It's true that the difficulty retargeting will try to get things back to 10 minutes but if the hash rate is higher at the start of the difficulty period and steadily reduces then the retargeting algorithm will leave the difficulty too high still and we'll still see longer pauses between blocks.
Right now is that the network is still slowly expanding so we've not really seen any of these effects come into play.