You cannot really say that OTF.
A child of 4 or 5 will go where they are brought whether it be GAA, rugby, football boxing, athletics etc etc most kids want to play sport and will eventually will find one that suits they the best or they may play to or 3 different sports. As they get older they make the decisions. If the hard work is done by adults when they are young to get them involved then you have a greater chance of holding on to them.
Do you think that many of the top intercounty players couldn't excell in another sport? Some do i.e. Star at basketball.
If adult GAA club members put in the hard graft and get more young players involved from an early age and make it enjoyable for them the better talented kids will emerge. As with everythig in life it's down to hard work and knowing where you want to be.