No, the important older theories lead to better theories.
Newton's gravitational physics made correct predictions of limited precision, and Newton's laws lead to the development of Navier-Stokes, kinetic theories of gasses,etc. Even phlogiston lead to the discovery of oxygen and the modern understanding of oxidation. You don't have to be 100% right to make useful predictions.
Vitalism, on the other hand, like astrology, didn't lead anywhere useful.
Another month, another rationality quotes thread. The rules are: