This almost never happens, to my knowledge. Most fields have people pursuing alternative hypotheses even when one thing is in vogue. For example, in the case of

This almost never happens, to my knowledge. Most fields have people pursuing alternative hypotheses even when one thing is in vogue. For example, in the case of Alzheimer's Disease there were and are a lot of other threads of research and I would be that your typical AD scientist would have had a good grasp of many of them regardless of the research they were focusing on. https://biology.stackexchange.com/questions/3223/what-alternatives-are-there-to-the-amyloid-hypothesis https://biology.stackexchange.com/questions/3223/what-altern...