I have to admit that it is very hard to imagine any effective sort of Procedural Control taking place in the very busy, & complicated , airspace that we have now. But, it would be a useful tool for ATC to use to provide some sort of service when Radar is u/s. Although, it should be possible to provide back-up Radar within a short while of a failure in the service.
Let's face it, if the Radar fails in busy airspace, it is an emergency situation which can only be resolved effectively by the use of a replacement Radar service. But, I continue to feel that Procedural experience & ability could help in the provision of a safe contingency ATC service, both in the immediate aftermath of the Radar failure & in the longer term, before the Radar is restored.