They just held a tournament to decide who would be the #1 contender to challenge Big E for the Intercontinental Championship. Tournaments imo are things that should only be done every once and awhile to make them feel more special, so I therefore veto this idea.
I think we'll probably get a ladder match at the Money In The Bank PPV to decide who the new WWE World Heavyweight Champion will be. They likely want to keep booking two ladder matches for the PPV (since that's what people have gotten used to seeing), and at least this way, it isn't for two separate MITB briefcases (which I sort of hate the thought of since there's only world title now) but rather one for the vacant championship and one for the briefcase.
We don't really need a WWE World Heavyweight Championship match at Payback. They can easily book The Shield versus Evolution as the main event, especially since we can safely assume it'll be the big blow off for this stable war.