I wonder if the elite track system leads to high drop out rates too. In the US everyone's on the same path, and even as a 10 year old level 5 you can see that you work, get to L6, L7...elite. It's within your control. In the UK you're at the mercy of the coaches and being in front of the right coach at the right time- first you've got to make it out of rec, then picked for the elite track...by the time you're 9 or 10 if you aren't on the radar it's likely you'll be left in grades or regionals for your gymnastics career. You're pretty much working your @rse off waiting for someone to notice you.
DD1 quit because while she was a fantastic gymnast, and was really moving ahead with skills, she was frustrated at not being moved along quicker. She wanted/wants to go as far as she can, and at 8 years old could pretty much see that elite gymnastics was an impossible dream because she was left in regional level 5 with no way out unless a coach took an interest and started moving her skills along faster.
Interestingly too DD2 has started a new club when DD1 left. It's much less formal and with a poorer programme- think YMCA vs. JO. But they do what I call the old fashioned sessions- everyone warms up, they get in rows to to rolls, cartwheels, and basic skills on the floor, then off to each piece. DD loves it far more than the BG-approved FUNdamentals stuff where they do two circuits- one of jumping over stuff, one of balancing, or whatever the theme is that week. The have no rec/team division, you join, and move up as you get the skills. If they find a kid at any point they thing has the talent to go elite they send them over to the big HPC club, but the rest all get the same training. It's far, far busier with many older kids hanging around to compete and coach.