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Well Brock is most likely facing Triple H. With Cena/Rock, it makes more sense to keep it that way (to me) because its the culmination of years worth of feuding. Putting Punk in there distills that. Punk's part of the tale is pretty much wrapped up.
As for people complaining about the same match, I think in other similar combat sports that sequels do big money. I'm not sure how well it translates to pro wrasslin', but I think the number of complainers will be much fewer than you think - probably limited to the smark audience.