The title is a bit of hyperbole, but time was I maintained two blogs and contributed to a third. Now? I contribute to that same third. What happened? Twitter. I don't know if it's good or not, but I suspect not. Trying to debate and cram in thoughts in 140 or so characters isn't as fulfilling....but it's quicker. And it helps you avoid having to write about stuff, really. You just tweet out a link to a story, add a pithy comment and it's gone, done with. Hey, you handled it.
Oh so many years ago (like around 5), you'd read a story or just have a thought (or have a thought on a story) and you'd provide the link in the course of a 2-5 paragraph excursion, complete with blockquotes from the story as well as from other related items. Now you tweet a link.
It's quick, it's also lazy but I don't think it's going to change.