After the close of Raw, do you think it's possible they set up a four-way dance for the title? They have established an animosity (some subtle, some more overt) between all four competitors. Also, it would seriously stack the odds against Bryan and truly make him an underdog, making his (presumed) win more impressive. Plus, you could still have Batista/Bryan and HHH/Bryan later down the line.
It just doesn't make sense at the moment for them to stick with Orton/Batista, especially if it is the closing match. They would HAVE to know what the reaction would be either a complete burial on the likes of Goldberg/Lesnar or crickets like HHH/Jericho or HHH/Orton.
I know that people keep saying "They can't possibly run Orton-Batista" but they honestly think it's a big match that people want to see, and all signs point to them signing an idiotic agreement to put Batista over for the title in the main event of the show. So no matter if everyone hates it or not, they're gonna do it. Bryan's probably gonna have to settle for getting the belt somewhere between Wrestlemani-RAW and Extreme Rules.