it is interesting to me how the uninformed become experts on issues through osmosis. Ratings apologists used to bash the diary when their favourite host went down, they would say silly things like, "oh, someone must have gone on vacation" or "The banker was too busy to remember to fill out the diary". But with the PPM, it doesn't work that way. Call it out for under sampling, I am right there with you. But, it is not a case of forgetting, in this case, logic and history cane be your guide. No more over listenership by the guy selling porn in Garland saying he listened to Russ for 4 hours a day when he was really hosing down one of the "theaters".
No, under sampled, yes, but not the cause. Russ's numbers are going down because he got his initial pop and people realise that he is the same, hack, one trick pony he always was.
He will continue going down until he finds the point where his old listeners can listen to him again, only now, they are fairly accurately measured.