As more data becomes available, that may happen, it’s part of the scientific method.
No need for more data, and it's often not scientific method as the driving force, but rather the bastardization of scientific method, which often conducts itself to promote and protect it's unfounded beliefs and desires.
If you want a good example, that you may be able to see, look at how the global warming agenda has been propagated by much of the scientific community. Those who don't play along are often marginalized or worse. The same kind of "science" is conducted in many fields of scientific study and results depend upon the preconceived desires of the political or even the religious/anti religious bent of academia. When already conditioned into a belief system it is very hard to see when it isn't purely impartial.