I would say that a ground campaign would defeat IS in Syria and Iraq. I cannot be bothered to dig for a definite source for that, but USA, EU military is vastly better than IS and I don't want to waste my time arguing with anyone who thinks that an America/EU/Russian alliance would lose a ground war against IS in Iraq and Syria.
Then why didn't the US win against the groups that are precursors to daesh when they had boots on the ground in Iraq?
Did the Allies win WW I?
I think it is pretty obvious that by most measures that the central powers did not win the war, but did that victory create a lasting peace?
It obviously didn't. The way the "victory" in WW I was handled pretty much set the stage for WW II.
It is the same way in the middle east, you can have a "victory" or "win" but that does not mean long lasting peace.
Here's my op-ed that uses long-term orientation, probabilistic thinking, numeracy, consider the alternative, reaching our actual goals, avoiding intuitive emotional reactions and attention bias, and other rationality techniques to suggest more rational responses to the Paris attacks and the ISIS threat. It's published in the Sunday edition of The Plain Dealer, a major newspaper (16th in the US). This is part of my broader project, Intentional Insights, of conveying rational thinking, including about politics, to a broad audience to raise the sanity waterline.