It's safe to say we all know that Hasbro has no inclination to pick up where Sideshow left off in terms of 12" figures.
HT will only do it with a movie tie in.
I doubt Hasbro will be open to a licensing agreement along the lines of what they had with Sideshow because ultimately it's about the $ as with everything after all is said and done.
If the remote/slim possibility exists that we'll another 1:6 brand/company pick up the GI JOE license and pick up/carry on where Sideshow left off so to speak, I'm guessing it'll be a brand new 1:6 brand/company not necessarily one of the usual suspects that is active in the hobby currently (i.e. DAM, etc.).
As foolhardy as this sounds, I like to think DAM could do it; however, I know that is not going to ever happen.