Why are you so against there being a built in modem on laptops? The built in modem is super tiny, light, and cheap, so it doesn't detract anything from your laptop if you don't use it. And I can tell you from first hand experience that there have been many times when it's been a massively useful feature!
There are still many many places where you can't get a wifi signal where and when you need it, even in New York. When I'm working away from my home there are times when I absolutely need to get online right away to look up some info on the web or email a crucial document, etc. In those cases all I need is any plain old telephone jack. I unplug the phone, stick the phone cord in my Powerbook's modem port, and the day is saved!
Most broadband services come with a small number of dial up hours included in addition to your high speed. I get 20 hours or dial up along with my unlimited DSL. I can't tell you how crucial this feature has been. It's not a feature I need on a regular basis, but on the rare occasion when there's no wifi around and I absolutely have to get on the net, I really do need it. And the built in modem saves the day.