Following discussion with other people on this proposal, we have located a flaw and I have determined a potential fix. If the price of the coin, for whatever reason, drops below the cost of mining one significantly for extended periods of time, miners will leave en-mass and there is little that would cause the price to go back up. It lacks the standard bitcoin "There is less miners now so it becomes cheaper to mine", which is what causes this issue.

To resolve this, I have proposed that (2×Difficulty)/2^(1+Y/2) could be changed to (2×Highest difficulty ever)/2^(1+Y/2).
This means that should mining rate suddenly decline, causing the difficulty to decline, the ratio coins/difficulty will increase above it's standard 2/21+Y/2 ratio, promoting a return to mining until stabilization of difficulty is resumed.

This is a way to implement roughly the same protections bitcoin has against miner exodus, as a loss of hash rate for bitcoin also receives the same response with coins/difficulty increasing.