The term blog, or weblog what it really means, was invented in 1997.
http://www.robotwisdom.com/log1997m12.html
The page looks extremely like a blog to me...
And this is here to stay, its not a fad, its been around for 8 years and will be around for another 20. Its just become "known" and more and more people are using it... The point here is not "oh I can make lotsa money with this by posting porn pics on it"... thats just a misuse of a blog to be honest...
Blogs might die away in the adult area, but they will remain forever online. Way too many tech blogs out there for them to die away. Its just a news site really, just made by a private person, why should that go away?