Full disclosure: I am a Fellow of the ACP and a big proponent of evidence-based medicine. However, I don't have a horse in this race, other than my desire to not see CKD become an inter-specialty football.) The ASN is right that lots of CKD is not being diagnosed or managed to prevent progression, but neither screening nor ignoring the problem may be the best way forward.
In my experience setting up chronic disease registries and decision support systems, 40-50% of the people in primary care with undiagnosed CKD have had an abnormal blood or urine test in the past two years. These tests weren't done for screening, and although abnormal, they didn't trigger a diagnosis by the provider. (The reasons for this are many, including the tricky nature of the serum creatinine in older adults and uncertainty about the diagnostic criteria on the part of the providers.) So, rather than go out and screen a new batch of folks and figure out how to get them plugged into care, the first thing to do is identify all the patients already in the practice with evidence of CKD and start managing them. These patients are currently under care for something, so we don't have to find them a provider. What we do need to do is build systems to identify them, bring them to the attention of their providers, and support them and the practices as they develop plans to prevent progression.
Very few practices have the tools to manage this job now. Screening a whole new population of CKD patients will just make the situation worse until we have systems in place to not only identify these patients, but engage them and their providers in the long-term process of averting, delaying, and mitigating progression to renal failure. Although Electronic Medical Records (EMRs) can help, none of the currently available EMR systems has the capacity to manage chronic care in a way that doesn't create a lot of extra work for the practice. Happily, there are systems that can do this at low cost and with good results, including documented reductions in overall utilization.
So, rather than argue about whether we should find more patients with CKD, let's work together to take better care of the patients we already have with undiagnosed and unmanaged disease.