Tomo2k, I do lighting design and you are wrong on Artnet. You can achieve up to 256 universes down a single cat5e cable with ArtNet II. Last year ArtNet III was released. With this new version RDM was added. This allows for BIcommunication. DMX is single way communication. RDM allows the console and lighting instruments to communicate. this allows for fixture settings and diog without leaving the booth. Also the instrument profiles to be stored on the unit itself. so setup would console sending out command 'what is there', the instruments reply with what they are, channel map, and address if assigned. Artnet is used a lot in the industry today. It allows better connection, speed, ease of setup. With ArtNet there is less cables and less cost in setup.
You in theory could do this, there is a project that did something similar with the enttec dongle
The project used a router with a arm processor and a modified linux kernel.
with this, you also have pass through on the network port if you use wifi
As for the network issue, YES, it uses full bandwith and needs special network equipment and routing.