We've even already gone through the process of predicting a dark particle that does not interact with the strong or electromagnetic forces to make an equation add up, and then waiting 35 years to be able to have a single detection of that particle. Neutrinos are "dark matter", we just don't call them that because we know that they're too hot and light to be responsible for the features of the universe that the term "dark matter" was coined as a placeholder name for.