In response to any proposition that Haye may become Heavyweight champ we're getting the uniform "Wlad will kill him," answer.

However, in the modern era of alphabet straps, multiple titles and money motivated sanctioning bodies there are several routes that Haye can take to become "World Champion" without meeting Klitschko.

So from that perspective it's not impossible for him to claim a belt in the next couple of years and call himself world champion.