As per usual - I'd like to have my say as well.
The USAF had the F-16's, but developed the A-10 for air support for their ground forces - main reason the F-16's etc. being too fast to be an effective ground attack aircraft (saw it on TV ok...
).
Our Impalas were mostly armed with rocket launchers and small bombs, to assist our ground forces (the F1's & Buccs were used for bombing ground targets before ground forces moved in(mud moving) - read Vlamgat by Dick Lord).
Of course our Hawks would be excellent in doing that. As others said, our Gripens would be more than capable as well, being able to fly so much slower than our Mirages and Cheetahs.
My point: it will all come down to the intensity and size of the battle. Our decision makers will probably then decide whether Hawks or Gripens will be used for assisting ground forces.
I HOPE someone will be VERY clever then, and use Rooivalk heli's to do the job. From what I read/heard somewhere, our main problem with exporting it was that it didn't have operational usage behind it.
I agree with Dean on the Gripen and Hawk used together. If you load a Hawk with laser guided bombs, the Gripen can lase it from high altitude acting as decoy, while a low level entry (below radar) by Hawks could be used to deliver the actual bombs. What will also help is the Gripen's stealth properties. So hopefully our targets will be bombed before they realised anyone to be on the way. That is of course if the an airplane can carry LGB's without FLIR (if the Hawk doesn't have it).