I don't think it's a matter of time.

You don't summarize the article so I will, the article identifies the concern that since governments can put monitoring control over large transactions they can keep tabs on the financial moves of terrorist organizations. The article also states that these monitoring controls don't exist for bitcoin, so bitcoin enables terrorist organizations to move and use money unseen from government.

What the article DOESN'T mention or acknowledge is that the only way for a terrorist organization to acquire bitcoin in large quantities is to us government controlled fiat to buy bitcoin. That transaction would be the trigger to the government that a terrorist organization is making some financial moves. It may force governments to act on suspected terrorist organizations earlier than usual, but I don't think bitcoin will enable terrorism any more than using dollars does. It's possible to counterfeit fiat...not bitcoin, which makes doing business (for a terrorist) more expensive.