Would improve teamplay perhaps, which is good.
But the fact that you have a minimap which you can look at instead of looking around you would change the game completely.
It would "dumb down" crpg and make it easier.
Personally I would like to see banners above heads of people removed so you can't tell the difference between friends and foes.
That would really improve teamplay as people would maybe change equipment accordingly and stick together more.