Won't: Too Predictable
In a dream match of this magnitude, along with the furore, comes a certain level of predictability.
Almost all the logical conclusions to this match point to the fact that the old warhorse puts over the young un', that the veteran gives the rub to the up and comer, that John Cena stares at the lights for Roman Reigns.
But is it that simple?
When John Cena faced the Rock at WrestleMania 28, the shoe was on the other foot but it was still the "Leader of the Cenation" that ate the pin.
Yes, it did result in a direly predictable 'Twice in the Lifetime' encounter the following year to even up the score, but the whole shindig did showcase the WWE's willingness to flip the script just to keep the audience on their toes.
By most rational admissions, Roman Reigns is expected to win at No Mercy. But don't rule out a John Cena victory all the same.