I would trade a couple people using hunter mods and other "cheats" to have addons back. People will always have an advantage in games, whether it be fps, ping, refresh rate, or just natural ability. As long as they aren't using a wallhack or aimbot I don't see the big deal.
Also, one of my friends said that he plays on a server that has a whitelist. I know you guys said that it's not possible but maybe there is a way that none of us know about. That would be pretty cool if it worked out, you could just block the addons that give you a slight advantage.