So it wasn't job security then, Teribus.
Glad we got that out of the way.

As to why....?
The answers to quite a lot of your questions are 'googleable'. You should give it a go, some day
He apparently did what he could within the framework given to him. To claim (or suggest) that he didn't, is to cast dispersions on his credibility, and you are not in the business of doing that, Teribus, are you?

Hans Blix was not the UNSC as you perfectly well know; he only reported to them. Forcing Saddam to comply was not his brief. It was not the US' brief, neither, come to think of it.
It was the UN's brief, Teribus, and they hadn't quite finished with their business. They weren't keeping to the same timeline that the US was, you see. So given a different set of circumstances (no imminent American Election, for instance), even if the inspectors did take another 6 months to complete their work, there should be no earthly reason why they shouldn't have been allowed to do what they were mandated to do: satisy the UNSC.

Jim