#4 The Rock
The Rock is regarded by many as one of the greatest WWE Superstars of all time and rightly so.
Winning the WWE Championship in his 20s, the Brahma Bull has had a legendary career, which includes a Royal Rumble win, Triple crown victory and WrestleMania main event.
Returning to the ring in 2011, it's clear that The Rock still has it, but last competed in a squash match at WrestleMania 32, with fans eager to see one last bout.
Outside of the ring, The Rock has become a huge success as an actor under his real name Dwayne Johnson.
With that said, Johnson's public image may take a hit if he competes after all the controversy with this country following both shows, so his return is probably the least likely on this entire list.