I am not sure how you can defend this logic.
What third alternative are you thinking of? Both? Creation by evolution is still evolution...
I am not saying there is an alternative. TOE is here to stay. Creationism/ID would need to stand on their own evidence regardless of the TOE. That is why the creation/ID crowd trying to attack TOE is so ridiculous. Why don't they spend time trying to validate their "theories"?
It most certainly does. The TOE being true deligitimizes creationism/ID. If the TOE is wrong, then at least they aren't being crazy by believing in something shown to be false.
Creationism/ID can be delegitimized without TOE even existing. They are delegitimized because there is no evidence. As I said before if TOE was proven wrong tomorrow, that does not make creationism/ID a default winner. They would still have to show evidence. Whatever replaced TOE would have to bring a wealth of evidence forward in order to be considered legitimate. Since TOE has a wealth of evidence it will not be overthrown tomorrow. It will be altered in the future as more evidence is gathered but not overthrown.
In you way of thinking if I saw something I couldn't identify flying through the air but I knew it wasn't a plan, then it would have to be a flying saucer from out of space. But no. It could be, and probably is, something that I could get evidence for and identify. Maybe it was a helicopter, or a balloon or a rocket.
Facts don't lie or have an agenda. Facts are just facts