Does anyone honestly believe that Katy will be successful past her 30s... Even the legends start to lose their voice around that time and, well, Katy doesn't really have much to lose.
Laugh at Gags for performing covers, but at least it's a sustainable reputation that will keep her raking in millions for years to come. Everybody knows that Katy is completely irrelevant outside of her eras (i.e. now), so I don't know where that will leave her once the inevitable impact of ageism sinks in.