Agree. It doesn't stop p-hacking, it just makes it harder. Definitely treating the symptom instead of the disease. We ultimately need institutional and cultural change, but it's not obvious how to do that in the short term, so making it harder to claim significance might be a step in the right direction.

On the other hand, you might expect that new discoveries by nature have less data since data is likely more expensive for brand new research, and by extension a lower likelihood of meeting these sorts of stringent statistical requirements. Decreasing the p-value threshold may be counter-productive if we dismiss legitimate new discoveries due to essentially economic constraints with data gathering, which would have the impact of making it less likely to get funding to pursue the problem in more depth, thereby slowing the advance of discoveries.