The web as it was in the early 90s was an alternative to major content delivery platforms (TV, press, mostly). So there was these massive systems that were the press and the TV who would own most of our attention span. And then there was this cute alternative technology with a great community that was yet unpolluted by the big guys.
Today, the big content guys colonized the medium, so it no longer feels like the web is "a cacophony of different sites and voices" to quote the article. But in fact, we're in the same situation: big guys with money and loads of content on one side and small guys with communities on the other side.
The web as it is today doesn't prevent you from spreading your ideas to the world on your very own server... And websites like reddit and hacker news are great amplifiers of small voices.
I would probably never have read this article if it had been published in the 90s. Since it's #1 on HN, perhaps 50k people have read it today! The way I use the web feels very much like the 90s: a few aggregation sites, a lot of excellent content written by independent guys, links between them...
Who cares about the centralized internet when the internet that we've loved since the 90s is still there and thriving?