I don't know about everyone else, but if they came out with some new features, or reduced the size, or even made one that looked sexier, I'd buy another netbook. Fact is, they haven't done any of that. I already have a netbook that works.
I understand that the manufacturers have their hands tied by restrictive licensing by Microsoft and Intel. They can only ship Windows on machines with 160GB hard drives, with 1GB of memory. There's probably also a limit on CPU performance.
Too bad, because a nice tablet computer would be an Asus Eee PC with a bigger screen and no keyboard and Windows XP. Or if they had a powerful enough CPU to drive the kind of display that's in an iPhone 4. Or even the previous iPhone.