They are trying, but to date they are just bairly able to walk. We will need a lost more processor power, and a better power source first. A lot of today's robots are teathered for power, and some need charge after just a few hours. Tracked units have trouble with dust in bearings, even with sealed bearings.
Not hopeless, just an Inherent oroblem. They could recover the lunar rover for recovery use....
:)>
RE: NASA is back on track to colonize the moon, by destroying some grains of moon material brought back by Apollo 17.