I would say the biggest hurdles would be the technical issues. If it were easy to detect laggers and prevent them from playing matchmaker I think we’d be happy to add that. There are some GPGNet messages called Bottleneck and BottleneckCleared that the server can see. I don’t know what they do but judging by their names they sound like they could possibly be used to detect at least when a game is lagging, and maybe that could be correlated to a particular player? I don’t really have the time to investigate that sort of thing at the moment though.
