In the period between 9/11 and the Iraq war, the word "Islamofascism" seemed to be a useful word -- a single word that described the anti-liberal current in some of the visible Islamic movements around the world.
But then, the War in Iraq actually happened, and then Iraq actually and really began to disintegrate into a Civil War. Most of the forces fighting against each other in Iraq could have been, or are right now, designated as "Islamofascist," including the Sunni Insurgents, the Shiite militias, the "foreign fighters", the Baathist "dead-enders." The reality of the Iraqi Civil War demonstrated that the word "Islamofascism" does not describe anything that actually exists in the real world.
Of course, there are anti-liberal and anti-modern ideas in some currents of Islam, and yes, there are some Islamic political actors who have totalitarian agendas.
Would that those who argued that "9/11 changed everything" would also recognize the outcome of the US Invasion of Iraq changes everything as well. (In a world in change is constant, does any assertion that a single event changes everything make any sense at all?)
Reality shreds the language that we create to describe it, which is why that accurately describing what it really going on right now is the hardest work of all.