Of your list, the only one who might challenge her if she runs is Pawlenty. He's a bit boring, but he's got some staying power.
If she runs, I think she's got the capacity to outdo the media. A major part of her campaign would likely be showing the lies and bias of the media. If anyone can run a campaign on the falsehoods of the media to the American public, it would be her. Whoever runs will have to take them head on for all their in the tank for Bambi corruption, and she's got the best chance of doing that correctly.
I think she HAS to do this, and I think she would do it with gusto.