Triple Age beating Punk made no sense considering Punk had a lot of momentum at the time.
Triple H beating or losing to Brock next year won't make a difference if Brock doesn't sign another contract since he'll be gone anyway. But it's still annoying to see Triple H get his win back in a rematch for a feud that already has a perfect ending as it is. Good guys don't always win, and in this case, it shows what a monster Brock is by breaking HHH's arm, HHH swearing revenge - especially after HBK is manhandled and has his arm broken as well - only to be forced to tap out to Brock in the eventual match anyway. Then Brock can go on to a new opponent who can be the one to put him down. Having him vow to break the Undertaker's streak as his final way of saying "Fuck You" to the WWE (since kayfabe wise, he has no respect for the WWE and thinks he's above it), only for Taker to be the one to put him down is a more satisfying conclusion to Brock's latest WWE run for me. Triple H could even get involved, suggesting that Taker should be the one to fight Brock, because he knows what a beast both Brock (whom he lost to) and Undertaker (whom he lost to the last two years in a row) is, and thinks that Taker could be the only one to stop Brock at this point.