If not for anecdotal data on stopping power you would have nothing.
If not for anecdotal evidence Marshall and Sanow would have nothing. The whole reputation of the .357 Magnum and the 125 grain bullet was built on anecdotal evidence and a faulty data set. Actual ballistic testing and forensic wound analysis certainly doesn't support those who claim how superior it is.
The CHP has used the .40 S&W for 20+ years. It has had excellent officer involved shooting results. There is no way of getting around that fact, or the fact those results are better, than previous results with their old .357 magnum weapons using 125 gr bullets.
Semi autos are never going away, LE agencies are never going to carry the .357 Magnum revolver again. The 9mm/40 S&W have proven themselves to be effective. They're here to stay for the foreseeable future.