I agree about the MacBook, but not the 13" Pro. I think that there may be a 13" Pro without an optical drive, but with a Core i5/i7 and discrete GPU. There isn't enough room in the MacBook Air profile for a discrete GPU, but there would be in the Pro if they dropped the optical drive. The Pro would also include Firewire or Lightpeak (though the latter may also make its way to the Air over time).
That would be a great 13" inch MBP. The one they have right now is great but as we all know technology moves very fast.
If somehow the MBA and MBP eventually merge into one line, it may be a good time to enter the netbook market. While we are not big enough and we don't have a PC sized market share, we can probably make a very decent Macbook for $500 dollars.
I don't think our iPad is a netbook, but actually much better and worthy for the rest of technology to copy which it will, but still in its own category.
With laptops, iPad, iPhone, iPod, iTunes, software, and desktops, the only major market that seems logical are the netbooks.
While we didn't have the capital to go into too many markets back in the late-1990s, we can expand now and maybe even do some Apple games and/or partner up with gaming companies. Call of Duty has been good investment for MS.