Dark Matter

I took an astronomy class last semester so this stuff interests me. Disproving the existence of dark matter would be a terrific feat, and a very notable scientific accomplishment. What will the consequences be? Beats the hell out of me. It most certainly will change the way astronomers think of the universe as they currently believe that 20-30% consists of dark matter, and would contradict the current thinking about the existence of stars in the outermost galaxies.