The Predator already carries out highly effective and precise CAS:
See here
The system also has the advantage of being able to transmit the imagery directly to ground forces (suitably equipped with a 'ROVER' system). It can self-lase Hellfire or buddy lase for another aircraft's weapons, and stick around to conduct BDA.
However, the feedback and SA issue remains key, as the article suggests.
Cheers
SBG