We know for a fact that the groups tasked with handling the chaotic psykers are working. We're just in a situation where it tends to be something like two steps forward and one step back.
While the Elite Operatives aren't going to be *finished* for a long ass time, we'll probably be seeing concrete benefits well before that point. Our Psyker Hunters and Witch Hunters are getting close to the point where we can institute an Elite program for them. Moving some of the psyker quarters out to the cities will provide another major bonus to our psykers in psyker hunting. General improvements to our trained psyker number and quality will also help, such as better force weapons our artisans are unlocking.
The issue is that the numbers of psykers we're dealing with continues to surge, as both our population continues to grow and the prevalence of psykers within it increase. We're at the point where the only chaos psykers that have a real chance of doing more than trivial damage are the Betas, and even then we've got a reasonable chance of taking them out fast. It's just that we're getting multiple Betas a turn.