My reply to this wonderful discussion that's never happened before is that I hope ILM remembers that they're not just Industrial Cgi Light and Cgi Magic all the time. They've done some really impressive things with Yoda in RotS, but they're still having trouble with human doubles coming off too weightless or inhuman. Anything that's not a human, they've done almost perfect with in my opinion. So do what's necessary to create the illusion, not just put a cgi band-aid on it for convience -sake.

Oh and, still not buying this. Keep releasing new versions of cgi jabba and yoda for the rest of your life, Lucas. I don't care.