The sky is falling fear mongering about arm injuries is getting to be pretty stupid at this point. There is no documented epidemic. What we are seeing is that unlike the 60s, 70s, 80s and 90s where kids would throw out their arm and thus never play again (we saw that all the time as kids); they can actually get surgery to fix the issues. There is no study that shows that arm injuries are worse now than they use to be; they just show having more and more surgeries because guess what; technology now allows it.
I have attempted to make this point many times. I wish you better luck.
Sorry guys, I have to respectfully disagree. I just jotted down the best six arms I could think of that came out of our area over the last five years. All were pulled in several different directions over the summer and fall to high profile showcases, area code, pitch for scouts, etc. where it becomes very difficult to keep a normal schedule and to say no. All had dads who were very "enthusiastic" about their kid's future and, thus, also had a hard time saying no. Four never made it out of HS due to arm issues. One threw too much summer after junior year and his velo dropped senior year, forcing him to go the JC route where he blew his arm out first year and had to leave the game. One was starting P for area code his junior year (along with all the other events mentioned), was high draft pick out of HS and blew his arm out first month of rookie ball.
There is another in our HS system who is highly touted, recently came back from USA baseball showing in NC, already committed to a D1. He is clearly showing fatigue but we can't convince him or dad to start saying no I believe because they have draft aspirations. (I guess they think my pleas are self-serving for the HS but that couldn't be further from the truth.) I have little doubt at this point that he will have more serious arm issues in the next 12-18 months.
On the flip side, we recently graduated a kid who throws very well but was never interested in playing summer or showcase ball and really had little interest in playing college ball unless something fell in his lap. So, he rarely threw outside of HS season. He finished his HS career sitting about 86. We talked him into spending a month or two of his post-senior summer (while his arm was still in shape) attending one local D1 college showcase tourney and playing on a local summer college team. He ended up on a D1 roster and is now sitting low 90's.
I agree that part of the "epidemic" is more awareness, more reporting and better medical technology to fix problems. And I know this is anecdotal and a small sampling but, again, it is EVERY one of the best throwers from our area. And I hear these stories play out again and again from colleagues in other areas. Hardly "sky is falling". There is definitely an issue with young kids pitching too many stressful innings over the course of each year and not getting adequate rest. And in most cases, it's the best pitchers being pulled from all directions and having a hard time saying no to the next "season", team, coach, dad, event, showcase, scout or other opportunity to be seen.
This certainly ties in to the OP's question about specialization.