I was engaged in a similar discussion in 2009 with Macdadtexas where he claimed Blu-Ray was already toast because streaming was so convenient and good enough for most people including him. Fourteen years later we are lamenting the pending loss of the hard format.
Streaming quality has improved in the interim, but there is a lot of texture in both sound and video quality between services and titles, and on average I much prefer the sound quality of Blu-Rays to streamed content. I think for audiophiles there is a lot be concerned about in losing Blu-Ray as an option as the streaming networks focus on the average consumer and costs. Perhaps once everyone has a very big data pipe from source to home this wont matter, and content providers will step up their game, but there seems little incentive now. I am going to start loading up on reference Blu-Ray disks ASAP.