#2 WWE Unforgiven
Unforgiven is also on the list of WWE's retro pay-per-views. Almost every Unforgiven featured a World Title Match as the main event. The last Unforgiven was in 2008 when Chris Jericho became the World Heavyweight Champion. If WWE were to bring back Unforgiven, it doesn't necessarily need to be an event for the main roster.
Instead of having Unforgiven as part of their main roster's pay-per-view schedule, it can be a Pay-per-view for NXT. What WWE can do is have an event either titled NXT TakeOver: Unforgiven.
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The timing of when Unforgiven should take place could be the fall season. Unforgiven could also be a show that replaces Clash of Champions since every title is defended at most WWE pay-per-views.