The other thing about goalkeeping is that for the longest time, people said it's better not to jump into goalkeeping too early. The NSCAA for example recommends that kids don't begin to specialize until age 12. But given how the game has evolved, and that kids as young as 8 are playing club ball, that's a little difficult to manage. It would require not playing soccer with goalkeepers until a later age (which always causes rebellions when it is suggested...the push back to the 4 v 4 no keepers was really severe when it was first rolled out..."it's not really soccer") or US Soccer mandating rotations in the position and expressly telling coaches that goalkeepers should not be allowed to do certain things that without specialization might lead to injuries (diving, one v ones, kstops, coming out for the cross). Right now, you have the situation that kids that are shunted into goal without the proper training are essentially sacrificial lambs, risking injury, bearing blame for potential losses since they don't have the skill to stop certain plays, and losing out on touches in the field (particularly if they are good in the goalkeeping role and the coach is win oriented). But if you are going to train them, it's really almost a sport entirely different with a different set of skills and you aren't going to get good at it unless either you are a natural or you start really early. And with kids starting to get their intense field training even earlier, waiting until age 12 puts keepers (who don't naturally get a lot of touches on ball anyway) at a huge development disadvantage (no wonder keepers peak so late into their prime!). The one thing that the US did very well was develop goalkeepers well....I'm not so sure that's going to be the case in the near future.