Yup. "Rumours" that started today just before you started typing this thread
HHH/Bryan or Bryan/HBK might sell the event if they continue to play up the angle over the next 3 months. But it still won't be the bigger draw. Punk vs HHH will still be a bigger draw at this point.
However, current WWE lacks the star power to remotely challenge last year's buys. The Rock's hollywood career was at its absolute peak at the time which probably boosted the buyrate by 20-30% at least. However, I highly doubt that even the Rock could save WMXXX at this point.