My biggest take away from this, and looking at the trend over the past 3 years is....
Physical media is DEAD.
In another three years, I expect we would find that less than 20% still buy physical. Now its making more and more sense why sony is making a digital-only PS5.
Its definitely going to be a niche. Even with the music industry being like over decade ahead in terms of this trend, physical CD sales made up 10% US music revenue and almost all big releases still have physical releases. So I imagine gaming being in a similar place at the end of the decade, meaning it at least will still be supported.