I'm not sure if the president gets the full scope of the ISIS problem from what I just read of his speech from last night.
Two things struck me as off-chord. The first was "ISIL is a terrorist organization, pure and simple." It's also a de-facto government in the areas of Iraq and Syria that it controls. That makes tackling it more of a military operation than a police operation.
If they were "just a terrorist organization" you would be able to root out cells by good detective work, working with the countries they are based in to try and find out where they were. However, ISIS has essentially killed off or driven off government authorities where they are operating, so a counter-terrorism approach isn't quite going to work.
What we're dealing with is more of a not-so-small army. A rather informal one, but treating them as a group of mad bombers is not all that effective.
The other point was discounting the religious element of ISIS- "ISIL is not 'Islamic.'"
It might not be a particularly healthy version of Islam, but they at least think it is. They don't call themselves the Humanitarian State or the Arab State. The fault lines in the conflict go on mostly religious lines, as they are preaching a hard-line Sunni vision of Islam and killing off any non-Sunnis that are in their path; the exceptions to the Sunni-vrs-everyone else is with the Kurds, who are mostly Sunni but both more moderate and non-Arab.
There are two points to trying to discount their Islamicness. One is to try and avoid making this a religious war and the other is to denigrate their faith in order to demonize them. However, ISIS sees this as a religious war. There is oftem more tribalism than theology in their support from ethnic Sunni Arabs who feel oppressed by Shia and Alwaite leaders in their territory, but they are running this as a religious war.
Those facts are a bit too politically incorrect to acknowledge, but they are there. Hopefully. the folks in the Pentagon and the CIA will be less PC behind the scenes.