Eh, I'm not too interested in seeing them feud again. Sting seems to already have his plate full with wrestlers who are currently a part of Aces & Eights. So, to me, his focus should be on what's in front of him rather than what MIGHT be in front of him a little bit down the line. However, I will say that my mind could be changed, depending on how they built up such a match. If they play up the "you're an old man in over your head and out of your league" deal, then I really wouldn't have much interest in it.
We've seen him feud against Sting several years back but Sting isn't what he was in the ring several years back. He's just not in the same physical condition he was when he was feuding with Styles over the TNA World Heavyweight Championship. If TNA could somehow manage to stretch such a program out that long which Styles is still walking the line between heel & face and keep it interesting, something I sincerely doubt, then beating up Sting at Slammiversary could keep the question alive as to where Styles will ultimately end up.
It all kind of depends on what they ultimately choose to do with Styles. Is he simply going to be the rogue, lone wolf whose only out for himself? Will he join Aces & Eights only to, eventually, reveal that he was a mole really working on Hogan's side and that the whole thing was some sort of act to get to the inner workings of the group? Will he join Aces & Eights with the intention of ousting Bully Ray, taking the title from him ultimately to take over for himself?
Personally, out of those scenarios, I prefer the third one if TNA ultimately intends to take the group into 2014.