Stopping people from using them in Adoulin zones won't make them team up though, SE will let trust be summoned while in a party at some point (at least they said they were looking into it) so people can have the best of both worlds I guess, but people who are anti-social will always be anti-social.
I agree that people who would rather fight 30 people for 15 mobs instead of teaming up for quicker kills is annoying, it's the only thing that annoys me about the way some people use trust but Adoulin isn't the only place RoE works and if someone wants to solo 20 mobs instead of teaming up for 5mins then that's their loss.