My house is a "techie" house. My Husband is in IT and we have all kinds of tech gadgets. And the Xbox, Playstation, iPad, iPhone, itouch, and the computer.
My kids also have a computer class at school. From Kindergarten.
My kids are 5 and 9, and they are very tech savvy.
However, they are not "addicted" to video games nor do they glue themselves to the screen all day nor are plugged in all day.
I don't have to nag them about it... because they don't have the problem of constantly using these things. They are very active and do many other things and outside as well. And they don't fight over the gadgets.
Right now, my daughter is drawing in her journal and my son is playing with his Legos. And we are having a play date today soon.
Not all kids are this way. Being constantly plugged in.
Whether or not, they have access to tech gadgets.
Also, though my kids may use the computer (we have MACs), my daughter will do projects on it. She can even make slideshows using our photos on the computer, and we even teach our 5 year old son, how to do that too. And he can. Or we make movies with them, with them thinking up the "skit" and they act it out, then we load it on the computer and we make a movie adding music to it etc.
So "screen" time, can really vary in the quality and the activities on it.
Or my kids do learning time on the computer.
They don't just play games. They aren't hung up on it.
If you don't want kids to be constantly playing video games or being plugged-in... then tell them stop it. And tell them to do something else.