He's 36 but not a natural HW, granted, but he's got a nice little 4 fight streak going since his loss to Vitali.

Albeit not all great names but he has beaten Eddie Chambers(UD) & Steve Cunningham(SD) within the 4 wins. He is supposedly to fight Kubrat Puvlev next, which will make it a pretty nice 5 fight streak if he can come through with the (w)!

Does anybody seriously believe he can win a serious HW world title though?

I'm not so sure he can topple a Klitschko, as he struggled to land anything noteworthy on Vitali, plus he isn't an overly huge puncher.