I think a huge ban everywhere would be a fine idea. Primates are NOT suited to captivity. It's hard to realize unless you have worked with or around non-domesticated mammals and birds, but wild animals are wild animals, you don't want to deal with 99% of them as "pets". It's fun to think about, but we don't understand nearly as much about them as we think we learn from amateur observations, and even if it seems like they do, they do NOT understand us. Pets are usually forced to base their behaviors around us off of fear of punishment and "learned helplessness", and that's just not a healthy state of mind for them to live in. It's a huge problem with dogs, who are actually suited to living with people, let alone primates! Even in dogs, for example, believe it or not, there are huge gaps of information about body language, and no clear answer on the ideal diet... and dogs are a VERY domesticated species! Primates are incredibly social and need to live in big groups with animals that understand and share their body language and behaviors. They have VERY complex social relationships within their groups that can't be created artificially well enough for their ideal mental and physical health.