No way Oda will write out the entire battle. We'll see Zoro's ultimate move, or he'll save Mihawk's life, and then Mihawk will pass out and Zoro gets the title. Half a page at most.
OR
No ZvM fight at all. Just like 2 panels. One of Zoro doing something, and another of Mihawk saying, "Now he's done something I couldn't. He has truly surpassed me."
Cursed bad timeline= Mihawk will have an Enel face.
Oda won't ever kill Mihawk, though.