This discussion is a bit difficult as the term conservative have both political and a more general meaning.
To categorically saying that conservative thinking (in the meaning of status quo) is always wrong is also wrong. There have been a lot of scientific theories put forward that has been proved wrong, but since it takes some time to become an established and well known theory most are proven wrong before it enters the broader public.
In that situation it's often best to sit back, keep a conservative look at things and wait for a "winning" theory to emerge.
One theory that gained quite a lot of momentum until it was proven totally wrong was the aether that transmitted light waves. It was finally put to death by Michelson and Morley.
https://en.wikipedia.org/wiki/Michelson%E2%80%93Morley_experiment
Today we have a scientific community that is a lot more humble than before, many scientists have come to the conclusion that they are not married to their theories and if proven wrong they will accept that without a lot of fuzz. But most scientists are "conservative" in the meaning that even if a new theory seems to describe a phenomenon slightly better than an old, most would agree that more research is needed. Before a new theory becomes mainstream there has to be compelling proofs and verification.
Quantum physics is over 100 years old but we still hasn't reached a consensus about how to interpret the equations. Is it a collapsing waveform, many worlds or some of the over 20 other interpretations that exist that is the true nature of quantum physics? Conservatism in this case becomes stick with what works the best and then we can sort out the details later.
https://en.wikipedia.org/wiki/Interpretations_of_quantum_mechanics
I think that the best way to approach science is to have a conservative mind but to be open for new ideas until proven faulty.
I watched with great interest but skepticism:
- Cold fusion (false, never consistently repeated)
- Super luminous neutrinos between Cern and Italy (false, a loose cable)
- Martian fossil bacteria (false, geological artefacts)
- Viking lander detecting signs of life (false, peroxides in the surface soil released oxygen) This one I believed at the time, but I was young then.
- Echoes from the Big Bang detected in the cosmic microwave background by BICEP2 (later attributed to dust but new independent measurements rule that out, the jury is still out on this)
- Gravitational waves detected (true... so far)
Göran