Well for a pro laptop... my pro laptop (Thinkpad) is hooked into a docking station right now. My external monitor, some USB drives, and ethernet are plugged into the dock. When I undock, I'm going mobile so I don't need an external monitor, USB hard drives, and I can work on wifi. In my ~3000 person office, this is by far the norm. Access to some systems are locked down on an IP address basis, assuming you'll be plugged into the wall that gives a static address.
So the point is, it might be called the MacBook Pro, but is it really geared towards professional users? Not even AV professionals anymore, with no Firewire and no disc drive.
Finally, if it really is a problem, buy the Thunderbolt to GigE adaptor.
You shouldn't have to buy accessories on a $2200 laptop which come standard on even a $200 netbook.