Man, you really are an HBK mark because there's no way that anyone, including HBK, is gonna beat the Taker at WrestleMania. Taker NEVER loses at WrestleMania. That is his legacy and even McMahon is not going to mess with that. I could see HBK beating Taker at another PPV, but not WrestleMania.
Now as far as HBK holding up the company when WCW was killing the WWF, that's not exactly true. Monday Nitro started beating Raw in the ratings during HBK's first title run in 1996. Then, during HBK's second WWF title run, HBK "lost his smile" and left the company while his Clique buddies down South were still beating McMahon in the ratings. Yeah, he really carried the company during the Monday Night Wars, uh, NOT! Meanwhile, guys like the Undertaker, Bret Hart, Steve Austin and Mankind were busting their asses to help the WWF defeat WCW once again. When the WWF finally beat WCW in the ratings, HBK was long gone from the WWF having lost the WWF title at WM 14 to Stone Cold ending his 3rd and final WWF title reign. (A title that he won thanks to the Montreal Screwjob).
Now, I think HBK is a great wrestler and he was definitely in his prime from 1992-1997, but he was also the biggest piece of shit in pro wrestling at the time. Abusing drugs and alcohol will do that to you. Hell, after a while, Triple H didn't even talk to him anymore. When HBK did finally return to WWE for good in 2002, he was still a pretty good wrestler and he was a better, more humble person too. Which is way more important.
HBK's feud with Jericho is probably the best feud of the year, but I don't see McMahon putting a major title around his waist. And I'm pretty sure HBK no longer cares about winning titles. He just wants to give the fans a good show.