I think your example already makes a case for it - your cart still contains 1.0. You couldn't get that any more, if digital were the only option. It's a beautiful thing, to have media that does not depend on the Internet, that no company has control of (unless they want to physically send someone to your house to confiscate it).
To me, that stability is so much more valuable than any add-on content. It works both ways, so there's tradeoffs, ie the latest updates are often not available on physical.
But yeah, I'm with you on most of it phasing out and us being dinosaurs.
I don't like digital, but I'm already old and would be fine if no new video games were released (physical or otherwise) starting today. I enjoy the paradigm of games I grew up with, and since it's voluntary, for-fun entertainment, I don't always have to adapt.
Personally, I think as consoles shift more digital, I'll shift more to PC.