Well if rumors are true about The Rock also competing at Summerlsam and next years Wrestlemania, I can see The Rock winning and fighting Cena again at Summerslam and then a 3rd match at next years Wrestlemania. Would I like to see at? No.
I will be rooting for Cena though as I have never really found The Rock entertaining in other than a campy way. I agree with the sentiments about how Cena is here week after week while The Rock isn't. Also I feel The Rock draws more simply because he draws in the casual fans. A bunch of old attitude fans are fickle and believe wrestling sucks now because there is no Rock, HBK, HHH, Undertaker, Stone Cold etc. which is mostly the WWE's fault for not really bringing in many new stars. I think because there are no recognizable names to the casual fan, they automatically assume it sucks. Also Raw might not give off the vibe that it doesn't suck. Everyone seems to be at fault here. Sometimes WWE puts on great matches on TV like Punk/Bryan but normally it's squash matches and promos with maybe 2 decent matches in between. The casual fan probably tunes in on the latter days and if they do hear Punk/Bryan is the main event, they don't know who they are and therefore change the channel.