Perhaps Warner Brothers steps up and purchases Toy Biz and through that gets Marvel Comics. No idea who would come over from DC to run Marvel at the time. Toy Biz would probably be absorbed into Matty or something like that. Or perhaps they would create a new division. Or maybe they don't even become involved in the first place, maybe no Avi Arad is the diversion point in this. IIRC there were contingencies in plan for Marvel to almost get Superman in the 80's. A letter or memo surfaced after the creation of the 52'Verse I believe.