Even if latency and packet loss weren't an issue for my use, there are additional restrictions that come in to play. For instance, my HOA doesn't allow any satellite dishes or microwave antennae to be mounted in the neighborhood. While petitioning my HOA for change would be much easier than trying to petition for national legislation, why should those companies be allowed to divvy service areas like gangs agreeing to stay out of each others' "turf"?
A duopoly is no better than a monopoly for all intents and purposes. It creates the illusion of choice. ISP A sucks at this, this and this, whereas ISP B sucks at that, that and that. There's a voting analogy to be made there, but let's try to stick to the topic at hand....