It's an interesting concept, no doubt about that. The lack of a CD Drive is slightly problematic, however, chances are you wouldn't be installing a bunch of programs and software on it anyways. It doesn't have the capabilities to run them nor the HD space.
An easy workaround for the lack of an optical drive is creating virtual drives and using your other computer to burn disk images. I'm sure anyone that would own one of these new macs would need a second computer.
It kind of sucks that you can't remove the battery, but in reality, not many people do. Same with things like upgrading the RAM and so on. It basically comes down to: if you want to make it any better, you have to pay Apple to do it for you. Which I guess kinda makes sense on their end. They also say the battery lasts for 5 hours, but when you are running the thing at full power and actively working on it I am curious to see what it actually rates at.
All in all, I don't think it will be a huge success like the macbooks were, but it will get some pretty good business, partially due to the name behind it. I just wish they would have unleashed some stuff that I would be more excited for.
You're not drunk if you can lie on the floor without holding on
(n.): Something that can be looked down on and approved of at the same time.