User blog comment:Neowitch/Luffy for Yonko!/@comment-27.32.144.252-20120111020355

It kind of makes sense, I mean in East Blue he fought the top pirates there. In the Grand Line he was fighting the Shichibukai. Then it escalated to Admirals during the war which just became too overwhelming. Post time-skip he's overcome that power difference, so I can see Yonkou being the next stepping stone.

Will he fight one straight away? Probably not, a Supernova seems more appropriate to give us an indication of how he matches up to the rest of his generation. As for becoming one, sure the public can call him whatever they like, Luffy just isn't the kind of character to embrace a title like that.