HHH only agrees to fight Bryan in a title match IF it's a "Loser Gets Fired" match, which allows for Bryan to not only beat HHH for the belt but remove him from TV as HHH is "fired" when he loses.
Cena can fight Brock Lesner meanwhile and they can get some mileage out of Brock effectively acknowledging that he's a piece of shit with no love for professional wrestling and refusing to fight Cena. Which gives Cena a plotline as he tries his best to get Lesner to fight him but Lesner refuses. Which segways in to the Rumble (where Brock and Cena finally are in the ring together) and ultimately Wrestlemania……
Bryan meanwhile can feud with Miz, since they have enough of a backstory storyline that they can waste a couple of months, perhaps with Steph sticking around and throwing herself behind Miz to try and avenge HHH's defeat/firing. Miz as a heel, especially a corporate heel, could do wonders for resurrecting his career and giving Bryan a decent, meaty storyline as far as Bryan's original arch enemy teaming up with the wife of his curent arch enemy to try and destroy him. And when Miz fails, they can have Steph move onto Sheamus (who fails) and finally, to Randy Orton to try and avenge HHH…..