I would never support purely blaming weightlifting. A big part of it is in general that baseball trainers believe that they cannot learn anything from any other sport, for some reason. Greg Shepherd called baseball the "last frontier of common sense weight training" 15 years ago, and I've not experienced or heard anything that has shown change in that. Oblique injuries are a lot more common now, and a lot of that has to do with improper focus on specific training rather than whole body training. Heck, the power in a swing or pitch is primarily from the bottom of the butt to the bottom of the rib cage, but look at the guys who seem to hit the weights at the professional level - they focus completely on their arms, chest, and shoulders. I would put a few key factors into why we "see" more TJ surgery: 1) Incredibly more media coverage and interest in fantasy baseball leading to a lot more knowledge about the surgeries. Thrylos' numbers show that while the numbers are higher the last three seasons, they're not drastically higher than 15 years ago. 2) Increased focus on velocity. A guy who tops out at 90mph is seen as a "soft-tosser" in the modern game. It's interesting to consider whether Jamie Moyer would have ever gotten a chance in the modern game at all, let alone until he was old enough to get AARP mailings. Focus on velocity has reduced the focus on proper mechanics and training as long as the arm can generate high-end velocity. 3) Increased utilization of breaking pitches and overall pitch counts at a young age. A pitcher on an American Legion team when I was that age would pitch roughly 15-20 games if he was really good in the course of a summer. Now there is high school, traveling games, showcase events, etc. One anonymous pitcher in a recent draft estimated that his total pitches thrown (he was a 4-year college pitcher) was in the range of 30,000 pitches in his lifetime to that point with roughly 10,000 of those being non-fastballs. The pitcher was cited as a control and command fastball/changeup pitcher in the podcast I heard on these numbers, so his non-fastball count was likely quite low compared to many other pitchers. I don't see this reversing as most people don't really see an issue here. They want the 95 mph throwing starter with three offspead/breaking pitches as well, and it's hard to see with current baseball training that focus on heavy early workload and focus on velocity would lead to any change in arm health for pitchers.