|Gigabit Ethernet ||USB 3.0||802.11n|
|Theoretical speed||1 Gigabit||5 Gigabit||0.3 Gigabit|
|Real world speed||1 Gigabit||??||0.05 Gigabit|
|Installed base||Everywhere||Some PCs (not Mac)||Everywhere|
|Reliability||Proven||Unproven/Dubious||Unreliable in public areas|
|Cable length||100+ meters||3-5 meters||(50-100 meters of air, less with walls)|
|Wireless Extension||Possible||Not possible||N/A|
Gigabit Ethernet is a good decision. End of story.
Well when you put it like that...
If they're smart they'll include power over ethernet (PoE+) so the camera can be powered as well as controlled over the single cable.
This spec looks like they want people to use a flock of cameras (what's the collective noun for these going to be?) all working together and sending synchronised data to a controller, without wireless latencies. There's a lot that can be done over a wire to provide guaranteed bandwidth that's not guaranteed over radio.