Receivers are joining cassette decks, CD players, VCRs and DVD players.

IF you're going to make a receiver, you'd better be a very big company with lots of resources for design to keep up with all the HDMI and Surround Format changes (same thing that killed the specialist DVD player), or the models better be critical to your companies survival.

Whose left:
Main Stream: Denon/Marantz, Sony, Yamaha.... Pioneer/Onkyo/Integra
Specialty: Anthem, Arcam, NAD, Rotel

Too many for the small percentage of sales in a category that continues to erode. Currently a large portion of which are loyalists upgrading their home theaters for 4K switching, with nothing mainstream on the horizon that will have them replace it again.

Our Industry has made AV so difficult, that by the time they settle on a TV purchase, they don't want to deal with any more decisions, "soundbar's good enough for what we watch".