This is a great post...I do however believe that too much pressure is put on kids to specialize in one sport, playing it exclusively and training year round. What happened to the days when we had many 3 sport athletes? Athletes learned skills from each sport that helped them in another sport.
I know there are many coaches (mostly at big schools) who basically tell players that if they expect to make a team they should not continue on with another sport. I see this as a huge mistake for any coach to make and wish there were more kids who continued on with all of there athletics. Everyone knows nearly all high school athletes will not continue on in athletics after high school so they should enjoy playing every sport they can while they can. IMO.