Scientific theories generally don't deal in absolutes like that. In fact, I'm skeptical of the generally accepted theoretical claim that we'll never be able to exceed the speed of light. But that doesn't make it any less of a valid scientific theory.
What's necessary for ID to be viable at all is for there to be living forms and features that are inexplicable by any current naturalistic theory. The longer that state of affairs continues, despite genuine attempts to come up with such theoretical models, the more likely that the ID theory would be correct.
Not to mention the spontaneous, unplanned time travel theory and the focused thetan energy theory. After a thousand years, they all become virtually certain, I guess.
I see, you're making the even weaker claim that ID says that some phenomena are *as yet* unexplained by current theories. This is a god-of-the-gaps argument and not very compelling.
Scientific theories generally don't deal in absolutes like that.
They often do. Energy is conserved by every physical process. Entropy of an isolated system never decreases.
But that's beside the point. ID isn't a scientific theory so it's free to make whatever kinds of claims its wants.