To address the thread title, it of course depends on what one considers 'dead'. Physical media sales, already in decline before, have really plummeted the last 4 years and will continue to decline. So yes, its pretty much dead. There will always be the enthusiasts and the 4K / Bluray will get bought and sold for many more years on the used market. If you really want the best quality, streaming isn't it. Not yet at least.