Maybe it'd motivate him after going for a loooooong time without a really good worker and promo guy to play off of.
HHH doesn't count. Edge doesn't count either because I've never heard him say anything on the mike that sounded epic Wrestlemania-worthy.
A pipe dream is a super-intense Flair/Cena program after reading that the new Rocky movie might inspire a last run in WWE. Flair wouldn't win, but he'd wrestle his ass off and retire afterward. End of Silverdome Redux has the old wrestling-based sport becoming wrestling-based entertainment. Sad ending, but it'd be the best way to send Cena off into the future as the face of this new fluffy WWE.
This can be done to a degree with Shawn, who simply represents the 90s and Attitude time periods. Shawn should retire afterward as well if they go the Rocky route. Then HHH can come back and become the salty old veteran.