Not well enough to justify the 2003 war.
(amongst other things, there is a high chance Iraq would end up in a similar place today without it)
I'm against the war but let's not play make-believe. Saddam would be in his mid-80s today, but even if he were dead, Qusay Hussein would be president today, and in his mid-50s. Hussein's sons were just as bloodthirsty as him and totally unfit to rule. And they would almost certainly have kept the same ruling party, personnel, and infrastructure that Saddam set up. Saddam himself wasn't the sole problem -- many of the top Ba'ath politicians, Republican Guard leaders, and Iraqi Army leaders joined insurgent groups, and eventually ISIS, after the fall of Saddam's government.
This is of course assuming Saddam doesn't start another war with his neighbors.
