While I do tend to agree a little with rickh, I agree a litle more with the article. A quick web search shows many blogs by developers that have issues with Ubuntu. Without Debian there would be no *buntu or of the other dozens of Debian derivative distros, that compose most of the top 20 at distrowatch.
The Linux Counter Machine Statistics page (
http://counter.li.org/reports/machines.php ) lists Debian as the most popular distro, although this is machines, not users, and of course only those that registered with the counter.
There are so many distros that are based on Debian that I don't see it going anywhere anytime soon, even if the majority of users end up using a derivative, and Debian exists as a base to those distros.(Which I don't see happening.)
Ubuntu has been the favorite of the week in the FOSS world, but not without cost. Debian project is struggling in crisis over the friction with Debian and Ubuntu communities. Debian developer Martin F. analyzes the situation and proposes some advises to Canonical/Ubuntu how to fix the awkward situation.
http://blog.madduck.net/debian/2006....ntu-and-debian
Distros like Knoppix, Kanotix, Sidux while not quite as popular as Ubuntu all contribute code changes back to Debian upstream.
One thing to keep in mind is that Debian and Ubuntu are pitched at very different audiences.
If you want to become a technical god, and learn the nuts and bolts of how linux works: choose Debian, and work within that community.
If you just want to use linux as a desktop, don’t really care about the technical challenges choose ubuntu, or one of the other many simple to install/use distros out there.
Either way in the long run it is all good for the linux community and for Debian.