It would truly be tragic for those things to become meaningless, as opposed to their current meaninglessness. The LHC was largely sold on the (false) idea that the Higgs could close the circle of physics, though this represents as much the ignorance of the politicians as the willful deception of administrators. If the LHC now fails that can become a good thing, as the next logical step to the study of physicis is a permanant presence outside the earth's atmosphere, which has far more potential benefits than just another big circle of magnets in the dirt.