It won't happen in the US, but maybe Italy, Germany?
"Might makes right" is truer than fiction, and the winners write the history. The US is relatively immune from accountability, and it's a shame that our one-time status as the only superpower was wasted on Iraq and Afghanistan.
Bush's pardon list will be extensive, and may even include himself, Cheney, Rice and Rumsfeld. That would render prosecution in the US futile.
I don't think they will be prosecuted in the US but regard it as entirely possible in one of the European states. The conviction would be largely symbolic. I certainly hope it happens. The victims deserve it.
Arf