Others have mentioned that blogs will kill the English language. The idea is that people in general—and Americans in particular—suck at the written language they are raised with, and by putting the power of instant publishing in the hands of anyone who feels the need to unironically transpose numbers and vowels into their everyday correspondence, one is encouraging poor spelling,
grammer grammar, and vocabulary.
Blogs won’t kill the English language. The best creative writing I’ve seen in the last 10 years was from a blog—and I didn’t have to pay for the “privilege” to read it.