Time is a one directional arrow. Evidence forced us into Afghanistan, the Bush administration forced us into Iraq. Hindsight says maybe we should have kept our powder dry, kept our nose to the wind, and not shot the entire load on the iffy prospect of Iraq. Would/coulda/shoulda don't matter now, the milk's been spilled and it's up to us to clean the mess up.
Yea, maybe a change in leadership would be a good thing, but ,you know, Bush won the last election so se la vie; that's how our system works. Presidents have wide leeway in matters of war so nothing will come of prosecuting the aledged mistakes; use Vietnam as a precedent of example.
Fear, not confidence, is probably what will prevent our nation from seeking different (better?) leadership, but time won't wait around for us to do the one thing or the other. Forward, march.