The only problem with this argument, which would be more at home in the op-eds, rather than posing as an objective news item, is that it is perfectly true that an increased threat of terrorism was both predictable and well predicted.
That's just a matter of simple common sense. The roots of the threat of terrorism against the United States are well understood, despite the pretense of naiveté in the mainstream media. The threat is real, and is a result of hatred for U.S. foreign policy in the Middle East, particularly our support for Israel, such as the destruction of Lebanon and opposition to an immediate cease-fire during the recent violence, which was just the latest example of a long and consistent history. Other legitimate grievances have resulted from U.S. support for despotic regimes, such as the Saud regime, Saddam Hussein, and the Shah of Iran, the latter of whom the U.S. supported after a CIA-backed coup overthrew the democratically elected Mossadegh. The hatred of our foreign policy is in no small part due to our own acts of aggression against Arab nations, such as shooting down a civilian passenger jet in Iranian airspace; the bombing of a pharmaceutical plant in Sudan responsible for producing half the country's medicines, which unknown dire consequences; the destruction of the Iraqi civilian infrastructure during the '91 Gulf War, with continuous bombing of Iraq since, peaking again with the '03 "shock and awe" campaign; the draconian sanctions regime against Iraq, directly responsible for more than a million deaths, including half a million children. The list goes on. It's well known, the reaction well understood.
To suppose that it was not realized that the invasion would increase hatred of U.S. foreign policy, and thus increase the threat of terrorism, is to feign ignorance. And while such a pretense is certainly common amongst the intelligentsia, it is not very plausible.
These were not acts of prescience by prophets warning of doom, but common sense observations of what would be a highly predictable result of any invasion of Iraq.
To suggest now that it "isn't quite true" that an increased threat of terrorism was one of the predicted consequences of the invasion of Iraq is an interesting case of selective amnesia. The fact is that it is very much true that this result, reiterated once again in the National Intelligence Estimate, was both predicable and widely predicted.