Why? There's no point. Yang beat Dennis twice, at his home turf. Even if Yang loses, the outcome would be somewhat inconsequential. They would have to schedule a fourth match, then fifth match...etc. smashmouth says it best that Yang officially owns Dennis. Not necessarily that Yang is the better player (but it's difficult to argue against that statement based on the outcomes of the two challenge matches), but that Yang definitely has Dennis' number.
I think this is the next logical step. I'd like to see Yang play Alex or Alcano. And I also agree the motive would be for Yang to be dubbed as the Pinoy Punisher, or the Filipino Flogger...lol. Just like Pacquiao has been to the Mexican boxing champions.