1: May leave: The Undertaker

Debuting at the 1990 Survivor Series, The Undertaker has had a career unlike anyone else.
With an incredible 24-2 streak at WrestleMania, the Deadman has held the WWE, World Heavyweight, WWE Tag, WCW Tag and Hardcore championships.
A Royal Rumble win only adds to the Phenom's list of accolades, but what sets him apart from everyone else is his longevity and respect.
But all good things do indeed come to an end, and it seems that time has finally caught up with The Undertaker.
With no plans currently known for him at WrestleMania, this year's showcase of the immortals could be just the third one he's missed (after 1994 and 2000).
A sure-fire Hall of Famer, the Deadman could easily go in in 2020, if he says goodbye to in-ring competition this year.