It's so strange when people say that such-and-such-internet-thing is dead. For the most part, I see no truth in that. There's SOME truth in SOME of it. Private mail servers are getting harder to use, because other servers don't trust them.
But blogs will work. The technology is as good as ever, and people can go read stuff on blogs. Maybe masses of people are choosing to do that less. That's not what being dead is. That's being less popular.
I mostly post on LinkedIn instead of my blog, because I like the shorter writing form.