...and the total discreditation of the "Pro" moniker is complete!
Really? I know there are some people that rely on things like Ethernet, FW and ODD as part of their workflow--but it hardly discredits the Pro moniker.
Right now the assumption is that people will have to use a USB 2.0-Ethernet adapter. If the machine has USB 3.0 it only stands to reason an updated adapter will be released. Besides that, it's the rare user that has to connect to ethernet for Internet access anymore. Most people, professionals included, have access to Wifi or a mobile hotspot device to provide their Internet connection. Some specialized uses may have to use an adapter, but I have no doubt a faster one will be made.
Firewire is somewhat disconcerting because most audio interfaces use it. That said, a FW800-USB 3.0 should come around quickly. USB 3.0 is faster than FW800 anyway, so attaching an adapter to the end of a cable is no big deal. We'll likely see new interface products designed with USB 3.0 or TB going forward as well. These are both superior connections. This loss is not going to be an issue.
As for the ODD, seriously, it's time to get over it. I own a recording studio and work out of two and use Mac Pros. If any pro category needs an ODD, you would think it would be us. We decided to completely remove the optical disc from our work flow about 6 months ago. Clients receive their final product on a USB drive if they want, or they can download it from our Dropbox.
We went through thousands of blank CD's every year. The cost and hassle was ridiculous. We wasted most of them referencing, and that's easier and more realistic digitally anyway.
Beyond that particular use, I can think of no software that isn't downloadable. Media content is also almost all easily downloadable. With the exception of Blu Ray, optical media is dead, and if you really want Blu Ray there are plenty of external options. Why Blu Ray would be necessary on a laptop is beyond me,(don't get me wrong, I use and appreciate the format) it's a format that is designed for home theater.