As long as they remain in the US, the top Bush officials are highly unlikely to ever get charged for torture.
But there is a group that will probably not be able to leave the US except under very controlled circumstances for fear of being arrested. Cheney, Gates, Rumsfeld, Ashcroft and Gonzales and their top aids. Even Bush would probably have to take some care. They would have to get promises ahead of time that they will not be arrested, and travel continuously in a tight security containment to keep them away from the public and those that might try for an arrest.
Jay