This is the kind of thing that I wouldn't spring on DH, especially if he is/was hooked on TV. If I told him "Hey, this week, no TV/computers" (even in a happy fun voice), he'd be pissed. He doesn't like being dictated to or given ultimatums (even ultimatums painted to look like "happy, fun family time").
What I would do is address the issue with him specifically. If you don't want to point the finger at him and say "Hun, you're watching too much TV," I would say something more like "Sorry that I threw that at you. I'm just concerned about us not spending as much time together as a family, and that the TV (computer, video games, whatever) is really drawing us away from each other. How about we sit down and pick one or two nights per week when it's no TV (or whatever) and go do something like X (go to the park, go geocaching, get into a squirt gun fight, family game night, etc.). I know you love baseball, and I promise we won't do these activities when X team plays, but when other teams play, how about a compromise, like, we'll be home to watch the game by X or we can play to do family activity and bring the radio so you can listen to the game."
I think it's really, really important, also, to recognize & reward the positive behaviors you are seeing. (IE, thank him for doing the dishes). Men like to be heroes, and if he thinks he's your hero (and the kids' hero) and that doing stuff for them helps with that, it will probably help him to want to the hard/boring/not-fun stuff more.