THANK YOU, THANK YOU, THANK YOU! You said it perfectly.
Everybody thinks that Apple should do this or that because Apple has so much success with everything else, that they could do this or that really well also. But like NT1440 said, just because they can doesn't mean they should.
Besides, ever stop to think that maybe Apple is successful because of the things they chose NOT to do? They're methodical in their process and will (usually) take the time necessary to develop a product right.
The netbook market is so incredibly new, I think Apple would be foolish to jump into it. I think it is wise on Apple's part to see what happens to the netbook craze. If netbook popularity dissipates into nothingness in the near future, Apple would look rather foolish if they had jumped into the craze.
I remember when those dopey mini discs (or whatever) and mini disc players were the newest thing. Those things went nowhere fast and now they are simply a novelty.
If the netbook market continues to have a presence and grows in the next year or two, it would then make more sense for Apple to produce a product to spank the competition.