Cena/HBK is the money match...if Vince is smart, he will pursue it. HHH's injury is actually an easy step in the right direction. Dump the Umaga program after the Rumble, get Cena and HBK teaming up against RKO leading to the eventual split and match at WM (due to HBK winning said Rumble with Undertaker coming in 2nd, who then gets a shot at Batista, but that's another story). How do you initiate the split? I don't know, but HBK would have to be a full blown heel. Not supercool heel like he did against Hulk in 05. Oh and do NOT align HBK with RKO at all.
Both HBK and UT could have one final title run, doesn't have to be long, and can then job the titles to upcoming stars. That won't happen, I know, I know... so don't waste your long posts telling me about how they won't job to the young, new guys, rather they'll job to guys like Cena, HHH and Batista. Just hypothetically speaking.