A-10's are the new Sandy's. When you make it to SERE and if you're lucky, you'll get to work with them in that role. And guess what, Sandy's are providing CAS. They are perfect for the role. Afterall, they were designed to fly low and deal with all the threats that you mentioned. Engines on pods, titanium bathtub, triple redundacies, need I go on.
Huh? A-10 pilots have been Sandy's for years. F-16's are becoming the new Sandy's, I think. You might know this, it wasn't clear in your post, but Sandy quals are for CSAR. In that role they can provide a limited amount of what is technically defined as CAS (i.e. ordinance around the survivor). In the Navy we don't have a separate CSAR lead qual, but crews that are FAC A qualified are also CSAR lead qualed.