Jim,
"And the bandwidth consumption in your estimate might be ...?"
I haven't bothered to get down and do some serious estimation in that area, yet. That might seem mind-boggling cavalier but I ask you to consider what's currently going on in the mobile domain where the exact same problem exists, except that the bandwidth constraints are worse:
http://www.svgopen.org/2003/papers/UsingSVGFor2DContentInMobile3DGames/I assume that whatever technology the gamers develop for mobile devices will quite usable in my architecture.
"Now we are reaching some common ground."
Welcome to my place. :-)
Zane