I think you might have a basic misunderstanding on how science works. Science makes a hypothesis based on the present knowledge but is willing to adapt based on new evidence. By changing the view of the universe, science is not moving their "goal post" but looking at new information and changing their theory. By refining our knowledge of habitable planets, we are not damaging the science but instead we are strengthening it. The ability to adapt to new information is a basic different between science and pseudo-science.