The only drug I know of that has been shown to raise GFR in CKD is bardoxolone, also an anti-inflammatory. It does so in diabetics with CKD and in a rare inherited type of KD called Alport syndrome.

https://www.ncbi.nlm.nih.gov/m/pubmed/29402767/

Diabetes is the most common cause of CKD, about 45%. So ABL might have quite a good market if approved for diabetic CKD by the FDA. And of course treatment would be lifelong.