Hmm... I've worked out with the jets, and most of what we do is Close Air Support. Yes, we certainly put pressure on the lines of communication but we maintain rather than advance the efforts against them. Ground retaken is done by units on the ground whom are only trained and advised by the west.
There is also the fact that the surrounding countries could always do more. People don't want it to spiral into full blown wide area conflict, but if the countries over the borders to Iraq and Syria feel the pressure enough more would be done to help. Obviously the reason they sit on the fence now is that Iran, Syria and Iraq have Shia leadership and the rest are Sunni. Their inclusion would upset the balance if the need isn't great enough.
Of course, the West could always do more as well. And if it looked desperate enough we probably would, the issue of course being that the military is very good at fighting and holding territory. We were not employed and trained to establish and create a new country in the vacuum and wake of where we have been. That is down to politicians, diplomats and international organisations, who often fall below the mark. The military then get the blame as we are the ones overtly on the ground!

Always a shame...