I can't accept that statement. If ID moves from hypothesis to a potentially falsifiable theory, there'd still be plenty of scientific reasons to oppose it ... just as there are plenty of scientific reasons to oppose most scientific theories. If there weren't, our understanding of physics, chemistry, and biology would never have improved.
Scientists should ALWAYS be allowed to question existing scientific theory and hypotheses --- even their own! --- in fact, it is necessary that this happens for science to be "science".
And before anyone states that this is why ID should be taught in schools, please understand that the scientific community wants issues that rise to the level of SCIENTIFIC theory be taught ...
I mean, I was taught multiple theories on why earth has a moon (captured by earth's gravity, chuck of the earth itself), so science definitely allows for multiple theories to be taught ... but not just ANYTHING. For instance, I couldn't say the moon was a paper-mache project I created in 2nd grade and taped to the sky ... as that theory is disproven by current evidence. For instance, I was a slacker in 2nd grade and didn't do my work.
Do you think it should be taught in our schools that all life evolved undirected from a single cell?