Yes, you're crazy. If your kids are tv addicts (or your dh) they'll drive you nuts and will try to wear you down. But it can be done if you stick to your guns.
To make sure this works, you will need to go into this with an artillery of activities to keep the family entertained sufficiently. Just like quitting anything else, you're going to have some serious withdrawls. It is shocking to the system if you're planning to go cold turkey as you have described.
Have a good supply of books, board games, crafts/hobbies, and other activities ready at a moments notice. All you need is a really miserably hot day or a stretch of nasty weather for temptation to turn to the boob tube to set in. Be ready for the first week or two to be extremely trying as it can be a shock to the system if you're used to the din of a t.v. in the background...especially for the wee ones.
Once you get a week or so under your belts, you will suddenly find that you don't miss the t.v. or electronic devices at all. It is very peaceful and you start finding that time flies when you're doing something other than watching tv.
We do television fasts during lent (usually mid March through April) and for the rest of the year we limit t.v. to only PBS and only a couple of hours a week. Other than that, no t.v.
We only have 19" t.v. and we've gotten used to the limited viewing and prehistoric provisions. However, when guests come over we find they're shocked there is no television in the main family area, and often when we have family gatherings, relatives absolutely go batty when they can't just flip on the t.v. and actually have to have a conversation or play a game for fun.
Just be ready for this to be like quitting cigarettes or any other nasty habit. Expect the troops to revolt before you experience peace and freedom.