I agree with Whirly, it's not only the physical aspect. Some people just don't make a good pilot. I personally think there should be more emphasis on aeronautical decision making. I also think there should be maximum hours instead of only minimum hours. As mentioned before in the RAF/Army/Navy you have certain numbers to make stage checks and final check and if you don't make those though luck. Of course before even be admitted to the training you have to do aptitude tests etc. Shouldn't the commercial world do the same? Obviously this would have to be imposed by the Aviation Authorities. I know this would/will upset a lot of people.
I fully understand that everybody should have the right to become a pilot, but really think some people shouldn't be flying.