I think the safety issue will only serve to keep metal out of the pros; it won't take the metal out of hs/college. Fungo makes the point --- people love offense, whatever it does to the game (look at basketball).
Many players here have pro dreams; many just want to enjoy their hs or college baseball experience as an enhancement to their education. Are you interested in using wood so that your player can be projected appropriately by the pros, for traditional baseball reasons, or for safety? All are valid reasons, but I don't know that any or all of them together would force a return to wood.
Even the safety issue may not be that compelling. (And I fully appreciate that if the injury is to your son or any player you care about, that issue is critical) But think of all the games played every year and the small number of injuries from comebackers. You'd have an infinitely easier time arguing in favor of outlawing cars based on safety than eliminating aluminum bats.
But the question about getting rid of metal bats should go back to: where the heck did aluminum come from originally? Does anyone here know? Those of us 'of a certain age' certainly didn't use aluminum as kids. (I've still got one of my old softball bats...and I have NO idea how I was able to swing that monster
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I believe it probably comes back to supply, economics, and durability. Bats that can be swung by young children so that they can be successful have to be pretty light. Light wood bats will break, and that gets expensive. Keep in mind that while we all talk about the $300 models, when our sons were first starting, the bats they used were under twenty bucks. And I would venture to say that the majority of young ball players out there are not investing what the average parent here does on equipment.
Then there's the supply question. Shall all youth leagues over a certain age go to wood as well as all hs? How about just colleges? Think about the number of college and JC programs out there. Where's all this wood coming from?