Finding any form of Dark Matter would be great. Currently we are forced to believe it’s there in order for our understanding of gravity to work. But since we have no idea what dark matter is, we can’t be certain that it even exists. Should it turn out not to exist, then we have a lot of work to do to make the rest of our theories hold up.

But finding direct evidence of dark matter, especially if it led to a good understanding of how it actually interacts with everything else besides gravitationally, would be a great affirmation of our models AND open up new avenues of discovery.