LaFrancia,
when pigs fly is just an expression in English that means it's impossible.
I think your English is just fine. While I agree those reforms would make the WTS a much better place, I also agree with the others that say it won't happen. I used to hold out hope that the WTS would reform but I've come to realize that the only changes they make are when they are forced to make them.
What you are describing is the GB giving up power and basically changing their high control structure. If they were to do that, the whole organization would spin out of their control. I suspect a large number of people would simply walk away if the threat of shunning wasn't there. Look at the number of people that leave despite the high cost of shunning.
As much as I'd like to see them change, its simply not going to happen.