In reply to MUSICHEAD.

She's getting older.She is 32 now.She is the same age as some of the mothers of the pop consumers of today.Pop is very much concentrated to an under 25 audience (especially pre-tweenies / tween ies / teenagers).They have to throw alot of $$$ behind Katy Perry for to have any sort of traction with this audience.
It seems to me that alot of better selling pop singers tend to sing with a patois / pidgin vocal delivery.This fits in with contemporary r 'n b / hip hop (rap) / EDM fusion that is popular with today's young consumers (inc. downloaders / streamers / youtubeviews etc.).Katy Perry doesn't really fit in with this style, alongside the age traction difficulty.She is no longer trendy with the young pop consumer's.
Katy Perry is very much still a 'live' draw - which were the money is in today's music (apart from endorsement's + merchandise perhaps).This is becoming more about Katy Perry as a nostalgia act, than a contemporary act, however.She still has to have just enough pop exposure / media exposure to keep this live draw going.