Two other concerns to consider. One is turning the kid off to the sport. It is one thing if the particular kid just wants to play that one sport and no other. But for those parents that insist their kids concentrate on lax year round, a relatively recent phenomenon, it will be interesting to see if those kids stick with it thru college (or high school even). Be careful not to make it into a job for that kid.
The other concern is a medical one. More and more doctors are becoming concerned about repetitive nature injuries arising out of year-round one sport athletes. Don't take my word for it - just do some research and you will find articles like this: http://www.nytimes.com/2014/06/11/opinion/sports-should-be-childs-play.html?_r=0.
