Players who insist on weakening themselves in order to collect better loot at no benefit to the group are just as insistent on doing things their way as those who are against it. Anything that forces the individual to choose between self benefit at the expense of group contribution is prone to such conflict.
As long as magic find works the way it does, this is unlikely to change. Those for it aren't going to suddenly stop wearing it any more than those against it will start. The only way I see this being remedied is if magic find benefits the group somehow, is removed, or can be added to armor in addition to the standard amount of stats rather than in place of.