Hi-Fi
So in summary, the Kellog loudspeaker continues happily after over 100 years and into the foreseeable future.
The solid state amplifier continues happily after 50 years and into the foreseeable future.
The 16 bit CD still wears the crown after 30 years and into the foreseeable future. Many people now copy the data to other places too.
Oh and at a recent publicity event, Dennon announced it now offers a range of non-hifi items which may nonetheless make interesting additions to your home AV environment, and interface well with modern non hi-fi services to which many happily subscribe.
Biting the hand that feeds IT
