I promise I’m not preaching. I truly don’t understand the rush back to soccer. Many frequently speak about their kids dreams to play college soccer but turn around and say their kid only plays soccer. WTF? I come from a time and place where kids played multiple sports. This travel ball mentality is new and very strange to me.
So I guess my question to all regardless of whether your kid is 8, 12, or 16 is how is only playing soccer beneficial? Doesn’t cross training increase athleticism and reduce risk of injury? Doesn’t cross training increase the chance of excelling in soccer?
I don't have the history at my finger tips, but the change began with the rise of the notion of "1000 touches a day" to become an expert at something, which really took off in the early 2000. And IIRC it began with music (piano or violin). The unfortunate reality is that there is some truth to that. Human beings learn through repetition and muscle memory. In either music or athletics, you want to get to the point where you don't have to think about something in order to execute it....your body has seen the scenario and just reacts to it.
Add to that complexity is that there is a lot to learn. Take goalkeeping for example. A goalkeeper (on top of being a great soccer player) must learn (partial list): handling and the various hand positions; positioning, footwork, and angel play; the low dive, the high dive, the forward dive (both collapse and extension, low/top/both hands); defending a cross or corner; high catches and tipping over bar; distribution (rolls, GKs, various throws, punts, sidewinder); defending the free kick; defending the penalty; tactics; communication; sweeper play and the backpass; and the 1 v 1 (and about 7+ different techniques to defend hem). Once a week group lessons starting at age 12 isn't going to get you all these things yet the game requires a GK to know (if not be a master in) all of them. It takes a year just to get the average kid GK to catch and dive without hurting themselves before you can even get to improving effective defensive play.
In the past a great all around athlete could fake it and make up with their athleticism. But that was before a few individuals began to specialize and really learn their craft. It's a bit of a prisoner's dilemma....if a few people are doing it, the others will fall behind unless they do it as well...it would take a collective agreement by everyone that no one is going to specialize, because as soon as 1 person does that person gains an inherent advantage.
It's not just limited to athletics either. In law and medicine, for example, people used to be a lot more generalized but the scope of knowledge has grown over the last 20 or so years that it's impossible for 1 person to learn it all. Even if medicine, for example, it's no longer enough to be just a urologist....instead you are a urologist that specializes in repairing bladder fissures. Add to that specifically that colleges are looking for that specialized athlete, and have in general put an emphasis on people doing amazing things instead of being "well rounded", and you have where we are today.