I think that would just hurt Reigns more tbh
it'll work but they gotta make Cena be completely despicable or the smarks will fukk it up
they could have Cena become increasingly frustrated during the match, finally snap and beat the shyt outta Taker, blood, chairs, AA thru the announce table and all that
then in the main event have him interfere and help HHH win, double team Reigns and beat him down similar to how HHH got beat at the end of TLC, Ambrose runs out for the save and gets his ass whooped too
WM ends with HHH still champion alongside a new face of the authority in heel Cena
no way smarks cheer that
next night on Raw by way of fukkery have HHH relinquish the title to Cena or some shyt and the summer of inevitable Cena/Reigns feud begins