I am from PA and have no bias towards or against specialization. I look at it as a personal decision. My only bias is that I think the child should be part of that decision. In many cases I see parents that push their children into specialization in pursuit of an unrealistic dream. To make matters worse, oftentimes the child isn't even interested in the dream, but pushed anyway.
That and the kid who wants to play multiple sports but gets punished by coaches who want her to specialize. Thats my biggest issue with specialization, the kid who is looked down upon for playing other sports. I have seen it on here even, comments about the kid on the team who isn't "invested" in her team because she plays basketball in the winter, or volleyball part of the year.
My dd's original travel org tried to make a rule that you couldn't be on their roster and play other sports. This was a B org that only played 5 tourneys a year and played in a 8 week league with other travel groups. But they were discussing it because they wanted to do what other orgs did... I about came unglued at a meeting. And it was put up to a vote by parents who wanted to force out the athletes who were keeping their daughters from starting. Dumb, 1 year later my dd and 6 other girls split off and joined another org.