We will never officially "get" Usama.
Why?
1) If he is killed, he becomes a martyr used to rally generations of terrorists.
2) If he is captured, he becomes a target for release by taking hostages everywhere.
It makes much more sense to render Usama impotent and running like a scared cat. Let the mighty Islamic Revolution see its leader neutered and cowering.
Every argument you make against "getting" Osama could be made against "getting" Saddam - but it didn't stop us. (Only difference is that Osama was leader of terrorists who were targeting us - and pulled off 9-11 - while Saddam didn't pose a credible threat to the US; on second thought - maybe that's why, according to your logic, there was no danger in capturing Saddam ).