This analogy doesn't tell us anything useful. It is not a logical certainty that W, X and Y render the need for W and Z useless, but it's certainly logically permissible depending on the actual values of the variables.

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.