WWE is in the midst of a talent shortage.
Long gone is the talent depth once seen during the Attitude Era. The shortage resulted from the retirements and departures of stars like Shawn Michaels, Bastista, Chris Jericho and Edge. Presently, there are only a number of true main event stars in the company.
The WWE currently employs many talented wrestlers, who due to an absence of a push, haven't lived up to their potential. Over the last few years there have been superstars successfully pushed to the main event. Superstars such as The Miz and Alberto Del Rio have all risen to main event status because of the faith the WWE had in them.
It's arguable that the stars on this list should have already been given an opportunity to run with the likes of John Cena and Randy Orton. With the current talent shortage, it's only a matter of time before the WWE gives these stars the pushes they deserve.