I can think of a lot of other options.
1) End the policy of "regime change" against Assad and openly team up with Assad to wipe out ISIS in Syria. Assad was initially working
with the United States in the global war on terror. But he never supported the war against his fellow Ba'thist Saddam Hussein, and more recently he was in talks with Iran for a gas pipeline that would have sold natural gas to Europe. Can't have that now can we?
Given the geopolitical tension (see Russia) which led to the civil war in Syria to begin with, that's probably not going to happen.
2) Quit giving any help to the FSA as they have shown themselves to be feckless at best and allies of ISIS at worst. It was the FSA that sold that American journalist to ISIS that got beheaded.
Agreed, but that is easier said than done. Once again you have the problem of ancillary organizations within the U.S. intelligence umbrella acting independently.
3) Bomb ISIS controlled oil wells. Oil is ISIS #1 source of income. Currently we aren't bombing the oil wells because we want to preserve them for a "post Assad" Syria. (See point #1) We are bombing ISIS controlled refineries but so what? They take crude oil across the border with Turkey and sell it for money or swap it for refined fuel. The only way to stop this is to take out the damn wells.
Future contracts come into play as you noted.
4) Let the CIA snatch and grab all Kuwaiti, Qatari and Saudi billionaires who are bankrolling ISIS. Seriously, why do we keep Osama Bin Laden's goat herder in Gitmo but the people financing this terror group are getting away scot free? Hell, we even know the names of these people.
Another logical alternative but the system will never let this take this place.
See:
http://www.newsweek.com/2014/11/14/how-does-isis-fund-its-reign-terror-282607.html
Treasury also singled out Qatari Salim al-Kuwaru, who secured “hundreds of thousands of dollars” for ISIS, as well as acting as the financier for the terror group’s Iraqi affiliates. A third Qatari targeted by Treasury is Abd al-Rahman bin ‘Umayr al-Nu’aymi, a funder and fixer for ISIS-linked Islamist groups in Syria and Iraq who, according to a December Treasury report, “oversaw the transfer of over $2 million per month to [Al-Qaeda] in Iraq for a period of time.”
Seriously, why isn't Mr. al-Kuwaru or Mr. Umayr al-Nu'aymi looking over his shoulder worrying about a drone strike? Because the whole global war on terrorism is a fake a farce and a fraud.