Well if early recruiting was limited you would certainly see a drop in hold backs. The advantage is gone as most boys will be in or through their growth spurts in Jr. Yr. Plus, leaving a kid back that has a chance of being recruited in 9th gr is easier to swallow because of instant gratification and you know where your kid stands playing younger kids. But trying to convince a kid to repeat 8th grade in hopes that they will stand out in 3 yrs against their younger counterparts is much riskier and harder. While I don't see it happening in the next 1-2 yrs, eventually there will be a change to age based play or early recruiting. I especially see this happening when the gamble of an early recruit doesn't pay off like coaches hope.