Isn't there Sherman act already? Why can't it be applied to ISPs? I.e. there are existing laws which can put an end to anticompetitive behavior of ISPs, but no one applies them. So why would adding more laws improve anything?
Well anti-trust law are mostly applied on case by case basis. I believe the un-official term for judging is "workable competition". I don't know whether the ISP market passes that definition.
There are also various prohibitions about collusion. And that's a major problem with ISPs, i.e. even if there are several in the area they agree not to compete and hold prices high for example. I never saw anyone applying these laws to ISPs so far. Not sure why that is, may be government is too much in their pocket to actually apply existing law.