Greg is gone without a bowl next year IMO. Granted I'm not paying it, but I don't see the buyout as being prohibitive at that point. New prez/AD is not a combo that leads to a lot of coaching job security unless you're killing it, and Greg ain't at the moment.
Now on the one hand, sure, that's not a great situation for a potential DC from the outside looking in. The flip side: if you do well (and as pointed out elsewhere in this thread, "well" is a low bar given where the defense is at the moment), you've got a pretty good shot at one of: 1) saving GS's, and by extension your, job; 2) being retained by the next HC, or 3) possibly even being that next HC. Of course, GS won't sell it that way, but could help make the job more appealing to the right candidate.