I've given this a lot of thought lately, and I honestly feel that this as the main event of WrestleMania 29 is probably the best way to go. Both for the company, and for the fans. In fact, the more I think about it, the more I realize that it's almost the most obvious choice everyone involved can make.
Let me explain: having a Hollywood movie star defend the main title of a company he is an absolute icon in against a legitimate fighter, who established himself both before and after his tenure in the WWE as a world champion, is a situation that draws both internally among the WWE Universe and externally among the casual fans that only watch during 'Mania season anyway, and among the fans that might've turned away from the product following the original departures of guys like The Rock and Brock Lesnar. So, in terms of pure profit, this would be the biggest possible match the company could put together to headline their biggest event of the year. It draws from absolutely every angle and type of fan the WWE has, or has had.
More to the point, the set up to the match writes itself. It's been ten years since Lesnar usurped The Rock as the Undisputed Champion at 2002's SummerSlam, and, given the WWE's recent proclivity toward rehashing events ten years after their inception in varying forms: (i.e. The Rock vs. John Cena in a dream match at WrestleMania 28 ten years after The Rock and Hogan had theirs at WrestleMania X-8), it makes sense to go this route; to build up and off of the fact that these are two of the biggest names in sports AND entertainment, not just in the WWE, and that they are colliding a full decade after they went head to head for the title, long before The Rock was starring in big-time films, and long before Lesnar earned his keep in the UFC.
As I said, the match draws from every single angle, but most importantly, it draws on the sheer uncertainty of what the fuck would happen in that ring, and what the outcome would ultimately be. It's completely unpredictable. And, it raises a myriad of questions: who goes over? The Rock or Lesnar? What happens the title when it's held by guys that aren't full-time? Who would win? How would they win? Etc. It would drive both the smarks and the marks completely nuts and would, I guarantee you, be worthy of the final spot on the card. Plus, it does what WrestleMania has failed to do as of late: puts the WWE Championship in the spotlight. And to be honest, I don't see how you could shine any bigger of a light on the title than to have The Rock defend it against Lesnar at WrestleMania.
As for how to get there, it's fairly easy. Triple H gets his return match against Brock Lesnar at the Royal Rumble, defeating Lesnar, who, completely pissed off at his loss to the Game, enters the Rumble match as a surprise entrant, and wins, much to the shock of the WWE Universe. Later that night, The Rock defeats C.M. Punk for the WWE Championship, an event that is followed by an attack and an F5 from Lesnar, leaving the Rock, who has just won the title, prone in the middle of the ring, the WrestleMania XXIX logo looming in the background. From there, the rest of WrestleMania's card kind of writes itself. You can have Punk go off the deep end for losing to the Rock at the Royal Rumble, and challenge the Undertaker to a match at WrestleMania to finally earn everyone's respect. You can have Cena and Ryback go at it for whatever reason, whatever you wanna do. The point is it frees up the rest of the roster to do what needs to be done, and unblocks a lot of booking issues we've been having recently.
Either way, you book it as above, have the match at 'Mania, please the fans, smark and mark alike, make a killer buy-rate, and finally, the best part: no matter who wins the match, it allows for a title unification scenario to occur. The title could either be vacated by the victor, or unified with whoever's the World Heavyweight Champion. You could have a YEAR-LONG TOURNAMENT to determine the new WWE Champion; fuck, you could even have Ziggler cash in then, saying he's the new WWE Champion, and work an angle off of that. Or, at the very least, it would get us a new championship belt.
But I digress. Feel free to discuss this scenario to your heart's content. I'm open to opinions, right or wrong.