More like... Old thing does W imperfectly. New thing does X. Proponents claim that X solves W's imperfections. Turns out that it doesn't. Opponents claim tha

More like... Old thing does W imperfectly. New thing does X. Proponents claim that X solves W's imperfections. Turns out that it doesn't. Opponents claim that X hasn't much value then, so it's doomed.