I mean sometimes it has /some/ effect. I'm in my late 20s, so was a kid somewhat recently. We grew up without television. We had movies, and we had the Internet, but no TV. My dad didn't want us mindlessly wasting time on stuff we weren't even interested in just because it was what was "on right now." Not to mention the accumulative hours of watching ads.

We all ended up more creative and artistic than our peers, and my relationships with my siblings are stronger than those of my friends. We read a lot (though people I knew with TV also often read a lot so I don't think that's necessarily a given, though I know I myself would not have been regularly reading a book a day in middle school if TV had been an option)

I'm just saying limiting time wasted on media is often net positive.