You do have a fondness for null hypotheses. Well, I can make ID a theory with a null hypothesis very easily:
Theory: Life was designed and fabricated from non living material purposefully by an entity neither living nor non-living, for being immaterial.
Null hypothesis: Life is an emergent property of non-living material that has achieved, by self-assembly, a self-replicating state that incorporates increasing amounts of unliving material.
Fine. Does that make it testable? I'm not sure. I don't think I'm smart enough to devise the test, certainly not on the fly. Is anyone else smart enough to do it? Not sure.
But then, I don't think I would have figured out how to test the expanding universe hypotheses with background radiation surveys... just because I can't do it doesn't mean it can't be done, and just because it can't be done doesn't mean it conceptually couldn't be done.
But in the end, you and I come back to the 'role of the schools' which I feel is more our point of disagreement. Frankly, any science as halfbaked as ID doesn't really belong in what I would consider an intro biology class - but neither does any of that early evolution stuff that has been waved about like a banner for 40 or 50 years. So fair is fair.