You have to parents here. Your are not liking the idea and your dh wants to go for it.
I think saving for a used DS is a good idea.
There is also no reason you cannot limit his use once he gets one. Be upfront about having time limits. No behavior is good in excess. Also there is no reason you cannot limit the type of games. I actually think it would be good for him because it give you time to interact and teach him your values.
I also think we need to understand why boys like video games so much, instead of belittling them for the usage.
http://findarticles.com/p/articles/m.../ai_n31944705/
Why boys like video games?
1. Since of power or control they may feel they have.
2. The challenge of the game - memory, puzzle figuring, quest, accomplishment rewarded.
3. Cope with emotions - stress release
4. Socialize and healthy competition with peers....hey have you got to level, I did this, is important to them.
5. It some cases if falls in the forbidden fruit. Parents don't want it, child craves it more.
6. The action in the game is not only violence.
I have a male and female child that love video games. They play together and work together as a team to solve problems. It is funny to watch this 15 and 10 year old work as a team. I have a female child that does not like them. This child had little ability to think strategically. She struggles with chest, pattern recognition, and some times of problem solving. Things video games can help teach. I have seen my 10 year old tell her you cannot forget about ABC because of this. We work with each child on their weaknesses and strengths. The child that doesn't like video games needs more work on strategy and planning -- she loves the social interaction of board games and cards.
I worry about all my kids. I think they all need to learn to take risk and do strategic planning like so games teach. I will work with what they like, limit, occasionally ban (temporarily) or change a games name.