Of course there are exceptions, but in aggregate, faster internet = more disposable income.
Thought I agree with the article that most web pages are needlessly bloated. I'm not a web developer, but I've seen a few demos of web sites where the customer comes to the developer's shop and is shown a demo of the new site. The page is hosted locally and many elements are cached on the developer's computer, so of course it's much faster than the average home user is going to experience. The customer rarely understands any of this.