If Darwinism fails then supernatural causes are back on the table and should be included in science.
I do not think there can be a science of the supernatural.
I do not think that if Darwinism fails that supernatural causes will become acceptable.
If the hope of ID is that supernatural causes will be allowed back into science if they can only just get rid of Darwinism, ID is doomed.
The tools and methods of ID cannot differentiate a supernatural cause from a natural cause anyways.