I find it a little odd he's come out and said that. From a business point of view, I use a tablet, but only as a supplement to my laptop.
It is not replacing my laptop.
If you have a netbook and all you do is social networking for personal use, then I think he's wrong. The border between smartphones that are getting bigger, and tablets that come in all shapes and sizes, is blurring. They add to productivity, but don't replace the laptop or desktop for me.