#3 Keeping things fresh
The Undertaker is no stranger to evolving his character. 2020 marks the 30th year since he debuted in WWE at Survivor Series 1990. Mark Calaway wouldn't have survived and had the longevity he has had in WWE without constant evolution and redefinition of The Undertaker character.
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The return of the Biker gimmick, or a hybrid of it with The Deadman persona could just be the next evolution of The Undertaker's character in 2020. The Undertaker has been using the previous "deadman" version of the character ever since he faced his brother Kane at WrestleMania XX, 16 years ago.
While i'm not suggesting that The Undertaker's persona has become stale by any means, Mark Calaway has a proven track record of having his finger firmly on the pulse of if and when The Undertaker character needs a change and needs to move with the times.
During a period of time in which many are questioning how much longer The Undertaker has left inside of a WWE ring, it would be just like Mark Calaway to try and prove the doubters wrong, completely redefine The Undertaker character and continue for a couple of more years.