The Snappers Rig is really impressive! :)
I think it all depends on the Artist, his Skills and his deadline. Many artists could create 100% real looking Charakters if they had the Time and Budget for it. But you also need to take Render- and Working Time into account, especially for Games.
Technically we could have Games with Graphics and expressions like the Snappers Tech Demo and maybe even better but it would limit the Game to high end PC's and also it would be very expensive to create. These two facts render the task uneconomic but the Graphics will still get better because of market pressure. At least thats what i think. ;)
Thanks for this great addition @remotehorst23 :-) I think your thoughts about the deadlines and other financially defined limitations is so very true! Yet another case that shows how the economy hides humanity's true potential ;-)