Just because one has wifi doesn't mean it's used all the time. I have an aircard, but I don't use it all the time. I like to See America, but what about when it's been the same scenery for hours, or when the train is stopped waiting to be passed, or when it's dark out? There are major dark areas for air cards, which would eliminate all but satellite internet. The poster who mentioned MA is correct. Once you leave Albany, there isn't much until Pittsfield, and not much until Springfield, and then not much till Worester, then it stays pretty good.
I'm sure there are people who would never look up from their laptop, but I don't think they are the majority.
And as pointed out, Amtrak should try to give what people want, not tell them what they want. Business travelers may use the train not to See America, but to wake up refreshed and showered at the destination, instead of waking up at 3am and taking the red eye.
-Greg Primrose
Co-Owner, Railroad.Net
Ave Atque Vale