We've had video calls on our phones for a while and after the first phone call you never use it again as you look stupid... plus the cameras on video phones are somehow less complementary than a passport photo.
I think if Apple where intelegent though they would release a version of iChat that is secure, but more importantly avaliable for PCs. The biggest user for this i imagine would be for the international business man who could join video confirences. They could run it for free and bass it on Skypes business plan.