Except the gain-of-function research specifically targeting covid-like viruses did not help us prepare or respond to the current pandemic one bit. On that basis alone we should suspend this research. It's not worth the risk.
In scientific research particularly, not having seen results yet doesn't mean we should abandon the research. If gain-of-function research is supposed to help us gain a better understanding of viruses and we're likely to see more pandemic-worthy viruses like SARS and SARS-CoV-2 arise naturally, I think any ban should be considered very carefully.