We said the same thing about guns when our oldest was a toddler. THen relatives bought him and his cousin Nerf guns when they were 4. THen they got him squirt guns. We had a very stern talk with him about real vs. fake, nad never shooting at people or animals. Ds doesn't even like playing with them.
Then we said the same about games. We will never have that in "our" house, and surprise surprise, fil gave ds money when he was 5 to get a gameboy. We didn't set any limitations on his playing, but we wouldn't buy his games. He could get them for holidays from others, or use his weekly $5 he gets from us. He played it for about a week and then never played with it unless friends wanted too. Then for the last Christmas fil bought the "family" a game cube and a couple of games, and a tv for gaming to put in ds room. I didn't say anything. Ds only played it when dh had time to play, and they only have Mario World and Mario Cart. Again we will not pay for games. Then for his last bd he got a DS light, and my brother gave him a PSP with a game and movie. I was pretty upset about it all and wanted my brother to take it back and give him something else, but it was to late.
The interesting thing is that with all these systems and games, ds and dh NEVER play them! We do alot of art, snowboarding, mountainbiking, reading, playing outside, etc. and he totally forgets we even have the stuff, or it seems. You can always tell the friends that come from homes where they are not aloud to have these though because it is the ONLY thing that they want to do . It makes ds mad because he wants to go outside and play and his friends are glued to the games. I think that doing anything in moderation is best, and everytime my parents or other parents that I see limit something so completely makes the kids later in life resent the parents and use or play with it all the time anyway.
We do not belive in moderating food, sleep, toys, tv, etc, and our boys rarely watch tv, eat only when hungry (vegetarian and no junk in the house anyway), fall asleep when tired, etc. Of course we have limits, but I think that when you raise your children in a good way, and give choices for these things, you would be surprised at how they respond.