You brought up a good point Johnny, and it really got me thinking.
Here's the way I see it. When I first read your idea about how Taker should put somebody over I was thinking "Come on, he's The Undertaker, how are you gonna disrespect him by ending his streak, even if he is leaving soon?" But then I thought about the good it could do for anyone who could break it, and I think you may be right. But like Jake said, it should NOT be Batista. Not only is Batista an older gentleman by wrestling standards, but he is already over enough to the point that ending Taker's streak wouldn't do for him nearly what it could do for some of the guys in the company who just haven't quite broken through that glass ceiling.
But of course you'd have to build up whoever it is at least a little before he ends Taker's streak, otherwise it would just look silly and would be a disgrace to Taker. For example, in my opinion Carlito's a talented guy with a lot of charisma who's still struggling to break away from the mid-card. Of course ending Taker's streak could do wonders for him, but if they did it now at the point Carlito's at, that wouldn't work. But if they built him up to a point where he at least had more credibilty, then it could give him an excellent push. No, I'm not saying Carlito should necessarily be the one to break the streak (although I wouldn't mind seeing it happen), I'm just giving an example.
I think a good example of someone who's already been built up enough but could use the push would be Mr. Kennedy. He's had a couple title shots, but we all knew he wouldn't win. He's beaten 7 world champions, but as I've pointed out before, anyone can beat guys who have been champion. He's been the United States champion, but so have a lot of people. So there's that balance there, he's done some impressive things that make him credible, but not to the point where he's past being able to use a gigantic push like that. But especially considering he very well might win the MITB match this year, by next year's Wrestlemania he might not need the push anymore. But if the circumstances were different and someone were to be in line to beat him this year, I think he'd be a great candidate.
But I do agree that CM Punk could be a good one too.