Obama is talking about "containment". He hasn't explained what he means by that, but he probably means doing as little as possible, drop a few bombs on 'em when they take the offensive, otherwise do little or nothing.
ISIS has made their plans clear. Take over the entire Middle East, turn it into an Islamic caliphate, drive out or exterminate Jews, Christians, Shia, Yazidi, anyone who doesn't buy their particular flavor of Islam.
I don't think "containment" is gonna cut it. I think we need to put an end to ISIS. This could be expensive. I did a combat tour with USAF in SouthEast Asia during the Viet Nam war. Both my younger brothers did combat tours with the Marines in South Viet Nam. My family knows how expensive and deadly a war against ISIS will be. We don't look forward to doing it.
If we don't do ISIS now, they will do us as soon as they get their act together. If we are gonna do a war with ISIS, druther do it in the Middle East than in Brooklyn. I don't know just what they will do, the airplane trick probably won't work for 'em a second time, but they will think of something. They might get nukes from the Iranians, or the Russkis, they might think of something brand new.
Right now, a couple of US divisions could wipe out ISIS. That's nothing. We raised 100 divisions to do WWII.