How can revenues not keep falling indefinitely? PFE has no pipeline, suffers increasingly from competition, faces further regulation & has no pricing power.
Some of these problems are sector-wide, but at least other pharmas have pipelines.
Drug companies live & die by research, having to come up with entire new product lines every 15 years, since it takes time to market approved new drugs. PFE has gotten by on acquisitions. Now it's paying the price.