I thought it was a good speech and glad he made the point about overuse.
You can specialize and not overuse.
My son played baseball only since the 8th grade. He hated s*ccer at a early age. Didn't care much for basketball even though he was tall. Football wasn't his thing either.
He did waterski, wakeboard, knee board, skeet shoot, bow shoot, long distance rifle shoot, hunt, fish, trap and various other things that may not be considered a sport. He also played very little Fall Ball after he was 12 or 13 and when he did, he didn't pitch past September or so (it interfered with his hunting). He did play catch periodically October thru January.
Moderation is the key, IMO!