Is reading changing?

Allegedly people are learning a new way of reading, thanks to the internet, which would better be described as skimming. Tony Karrer defends this change:

Yes, we need opportunities to reflect, but for me that's blogging. I'm reflecting on his article as I write. But, indeed, I skimmed through passages.

I’m skeptical that skimming + blogging is as good as careful reading in the first place. I suppose with blogging there’s no accountability to master the material, so you can get a way with skimming and take away whatever you like from a piece without needing to accurately grasp the author’s arguments or position. Perhaps skimming is good enough, then, for what Mr. Karrer is trying to accomplish.

Bit if reading does change to skimming, should writing change to accommodate? Where does that leave the types of writing that aren’t amenable to skimming, like the development of a complex argument or a narrative?