FIOS will kill comcast by giving people more bandwidth then they currently need, would use, or even notice? I'm a pretty hardcore downloader and don't see any reason I need more bandwidth today. It is not going to kill comcast that a few nerds think FIOS is "sweet". Its a great and reliable product for me.
FIOS has single digit latency to many large sites, even halfway across the country. If you've never used it, its hard to describe how much snappier everything feels.
Waiting 60ms each for a dozen or so dns lookups may not feel slow if you're used to dsl, but FIOS is just a whole different animal. Even the neophytes in my family get it instantly when they use it.
Please feel free to explain to my senile parents and their equally if not more senile friends as to why their internet connection (which will usually be the best residential connection they can get without paying fortunes) sucks for downloading HD and regular movie rentals from iTunes.
I try, but it's hard to get across that it's a monopolized and generally awful situation where apathetic people aren't helping just because they don't perceive a need for better bandwidth anytime soon.
At the least, what an increase of bandwidth will do for those really apathetic people is to lower the prices of what they have now. So you should consider FIOS to be "sweet" because it means you can pay less for whatever speeds you have now, not just because it's way faster.