I think the basics have gone the way of the dodo for many reasons.....
Why is it that you go by a ball field and almost never see kids playing a pickup game of ball?
2 Income families comes to mind. When we were kids, Mom was home all day (though my mom worked at night to pay the bills) and you went to the park to play ball with your friends knowing you could head home whenever you wanted to or needed to. Now young kids have nannies, play dates, after school care and daycare. There is no free time and very little social interaction without grown up control. Why are there 2 income households? To pay for a bigger house so the kids have room to play at home
Video Games!!! My worst enemy. I hate these darn things!! Kids are getting slow (running and thinking) fat and lazy because of these things. I resisted letting my son have one for the longest time, but his mother bought him one.... He will come up to me and ask me if I want to watch him play a game..... I tell him yes, if it's outside and there is real activity.
Safety Issues? Today's parents (me included) are scared to death that someone is going to run off with our kids or molest them. The idea of just letting them run around the neighborhood, though normal in our youth, is unthinkable today. How can the kids have a pickup game if they don't get to socialize freely?
More games than practices. With the proliferation of travel ball, players are playing more games and having less time for practice. You build skills at practice!! They need to practice... They need to play.... they need to be kids!!!
Just as a side note, my 12 yo son and I were biking around the neighborhood yesterday and we came across a pickup game of baseball at a local park (not even a ball field). He looked and me and I looked at him and he rode over and joined the game. I told him to come home when he was done and went on riding..... I rode around for a short while and went home. 3 minutes later he came in the door. The other kids were tired and went home