Nothing at all. Assuming that NASA is ok with replacing human astronauts on orbit with cardboard standees in hard vacuum, since none of these craft have life-support capabilities.
I'm sure NASA would be just fine sending up a couple of their Robotnaut modules. This could actually provide a viable alternative for satellite/space station repair in lieu of manned shuttle flights.
http://www.youtube.com/watch?v=Yadj3asTyc0