I think apple is moving in a great direction personally. I like many others rarely use my SuperDrive, that isn't to say I don't use it but I wouldn't mind losing it in favor of better graphics/storage/processing power. With the soon to be available 'thunderbolt displays' you have a FireWire 800 and Ethernet option off the bat (granted it'll cost you an extra grand but it's apple we are talking about here).
With the advent of time machine and time capsule I keep waiting for apple to release a dedicated home server/storage infrastructure. But for now many of us will have to settle with drobo, promise, or a sonnet device to have more storage capacity. I think Apple is heading to a place where your portables can 'dock' with desktop power equipment and storage for when you need it. And eliminate the need for both desktop/laptop users. However the pro's editing creative content are not in this; they still need their machines; I'm talking about the average apple consumer.
With this scenario of a 15" air/pro given that it could meet or exceed performance of the current lineup, sacrificing certain things for portability and keeping the thunderbolt open for hardcore storage and ports a plenty when needed.
Those of you with children watching DVDs rip them using handbrake-or carry an external drive. I havn't bought a DVD unless it was unavailable online since '06 and to be honest I'd prefer to not have to worry about my kids messing with the disc/loosing/scratching. I'd be more comfortable letting them have my iPod touch to watch nemo, on a plane, let them have my iPad, but that's just my opinion.
Apple demoted the 'mac' to just a device, I think external storage will take a different role, where we can dump our content and access it via cloud(s) in the future, where a 128-256-512 on board storage will be more than adaequate.