What wouldhappen if Marvel were to get his rights back? I think the big positive thing would be them reprinting the old ROM SpaceKnight stuff.
Other than that we would get a ROM movie but James Gunn would be directing it (because he said it was one of his dream projects but he would only do it if Marvel had the rights) and depending on how you feel about him that would be a good or bad think.
Can say about the comics since most of the current Marvel talent isn't that good. Unless they can get Gage to go to Marvel and do a long run I wouldn't get my hopes up, it would just be Guardians all over again.