It all seems quite simple to me really. If we are going to have a fitness test, set the standard, set the currrency period and stick to it. If you fail, you get 6 months to train to pass it. If after 6 months you can't pass it you get booted out - no exeptions. If you are medicaly not able to take the test you get a medical discharge. If your inability to take the test is due to injury that is the attributable to the service, you get suitable compensation and a discharge.
If I were to fail my PME because I did not meet the prescribed medical standards, I would expect to stop flying. If I were to fail meet the rather basic fitness requirements of a military service, I would expect to stop serving.
Now let's stop fannying about, get rid of a few fatties and I'm sure gym attendance will rocket. It might make your average Waaf a little easier on the eye as well.
Rant over.