Well, your dealing with a societal issue in general. It's not urbanization so much as things like having both parents working, an extremely liberal society that makes catching and dealing with criminals extremely difficult, and of course the simple fact that over the years precedent has been established by people without kids who don't want them running around their houses and yards being able to effectively ban kids playing in an area, enforce strict curfews, and other things. Today the stereotype of the crotchedy old man yelling at the kids to get off his lawn isn't as common as it used to be, because those old dudes went to the goverment and had laws passed where they don't have to run them off. Kid gets on their lawn, he calls the police, and next thing you know the parents are paying a fine (which also means they aren't being encouraged to let the kid roam the streets).
Then of course there are other dangers due to increasing levels of drugs, street crimes, and other things. Even playgrounds and such aren't safe unless a parent is there to supervise, and sadly with both parents working nowadays there is no "homemaker" to really raise the kids.
People sit down and like to present things as people using the TV or games as an "electronic parenting unit" but that's only part of the story. Things got to that level for some pretty good reasons. Right now anyone who suggests that one parent should be staying at home, especially if it's the mother, is usually flamed heavily.
I think a lot of people who write articles about the state of children and such live in a fantasy land of TV sitcoms and such which they feel represent reality for the average American. That's not the case. What's more most of these observations are good at pointing out problems, which anyone can do, but do not present much in the way of viable solutions.
Let's say you take away the TV and games, that isn't going to make the kids go outside. Saying the parents should be around more and take a more active hand is common sense, but at the same token families need two incomes nowadays to make ends meet. Attempts to clean up neighborhoods so kids can walk around in safety meet with resistance due to inevitable civil liberties protests on one grounds or another. You can't just get rid of hookers, crack dealers, and other elements because even if common sense makes it obvious what they are doing our society doesn't work based on common sense but the word of law, which makes it very difficult to prove a lot of crimes well enough to get rid of people, and even if you DO get them locked up the elements don't disappear because criminals are being released from prison back into their old habitats every day, and in numbers equal to those going in. Not to mention the issue of where you lock a lot of people up. In some areas you could probably do a police sweep and arrest thousands of people with good evidence, but in the end where do you put them all? We already have problems with prisons overflowing.
A lot of issues interrelate. In this case however blaming the video games is popular because it seems like something people can do something about, even as a totally false scapegoat.
Honestly, I think the REAL issues involved are all things that could be dealt with, but it involves clashing with a lot of people, putting a lot of established morality on the backburner, doing a lot of things that would be considered unfair, and with our current population probably killing a few million people by employing Hollywood "Elliot Ness" type law enforcement. Of course nobody wants to do that (for obvious reasons) so the problems persist and people whine about whatever scapegoat they can find, this week it's video games.
Such are my thoughts as unpleasant as they are.