Easy to say, not so easy to do.
A few special forces and lots of Iraqi opposition toppling him?
What opposition? Totally fragmented, different groups hate each
other, the Iraqi military is strong in local terms, not like the Taliban.
200,000 US and probably up to 30.000 British troops?
Where from? The Saudis won't play this time, nor will any other Arab states, with the possible exception of Kuwait, which won't be enough.
Assuming a change of Arab policy, however unlikely, high potential casualties, this won't be Desert Storm 2, lots of close quarter fighting in built up areas with also high civillan casualties.
Remember, at least 1 million Iraqis are reliant on the current regime, they've nothing to lose, not like running from Kuwait.
Blair could lose everything, most of his party will not wear UK support, not without very clear proof of Iraqi involement in Sept 11th, and there is not any of that.
He could ride out opposition, but when a British Prime Minister hits the inevitable problems, usually domestic, he then needs his parties support.
Opinion polls suggest a majority of the UK electorate are not in favour either, they support the war against terror, but not what looks like unfinished Bush family business.
Most Americans would probably support an attack, high casualties and/or slow progress, or even failure, would soon change that.
So Bush could lose out too.
Saddam may be evil, I doubt he's stupid. His goal is his survival, not his people's.
Backed into a corner facing defeat, the chemical/biological weapons could be unleashed.
Perhaps against the US itself, in the form of long term sleeper agents using them.
Remember, Sept. 11th was carried out by 19 men with box-cutters, who needs easy to detect and destroy long range missiles?
Then what will replace him? An Iranian dominated Southern Iraq, with civil war involving the fractious Kurds in the North?
If it can be done avoiding the pitfalls above, great, but there are more pressing problems in the region now, the US needs to help solve them and get a bit of credibility back in that part of the world first.
Saddam is boxed in, keep it that way until a workable solution to the problem of his being in power can emerge, and it will eventually.