It would be exactly like that match. There are still going to be chants for Bryan I'm sure, at least the crowd have Lesnar to cheer for now. Only little kids buy merchandise, Cena and Reigns are popular with that demographic sure, and that's the only demographic that wants to see either of them anywhere near the main event, let alone both.
Brock killed Cena even more at Summerslam, by your logic he shouldn't have wanted a rematch and should have just fecked off from the title picture. Anyway, I repeat - the streak was absolutely legendary and it was broken, you need absolutely no justification for a rematch. Its pro wrestling, it doesn't have to be hyper-realistic, the fact he got destroyed last time doesn't he can't come back stronger and win. His character is an undead zombie mortician who survived being lit on fire in a coffin ffs