Depends if Vince wants his new hips to be plastic or bionic.
In all seriousness though. I can see a Part III happening depending on how some guys develop over this next year. Let's face it WWE is all about making money. Many hardcore fans of course don't want to see a Part III BUT to the casual fan they're gonna be all for it. And regardless should Part III take place, WrestleMania will sell out AGAIN and the PPV buys will be high.