In fact, at this point the answer seems to be a resounding yes, by all accounts. Time will tell if the new regime is US-friendly, but here's what's happened so far:
1) an anti-US dictator that committed literally hundreds of war crimes in his tenure has been dethroned setting up the possibility of a true democracy in the nation to go along with the rest of the democratic movements sweeping the region.
2) oil prices have already dropped. Since we helped the rebels odds are they will help us with regards to oil prices.
Were the airstrikes that took out Milosovich and led to stability in the former Yugoslavia also not worth the price in your opinion?