I think a lot of it is lost on the reality show/competition audiences of today. The basic concept and conceit is very common these days. Other shows have used its skeletal framework, from Cats to Starlight Express. Everyone steps forward, does their bit, and somebody wins a big prize at the end.
In a way, ACL was the first "reality musical."
So the innovation and freshness is gone now. It's a period piece of historical importance. But that feels more like walking through a living museum. It's also big nostalgia for many of us who were drawn closer to the theatre after seeing it.
I remember being horrified when Music Man started to lose its brilliance. Most people don't get that show today, either. They see it as a frivilous cartoon and that's all.
Be ready for the EXACT same thing to happen to today's big shows. And I mean all of them, including Sondheim's. His will last longer than most, as did Rodger's & Hammerstein's. But his will eventually fade in their relevance and impact too, into respected museum pieces from a bygone era.
The first to go will be the shows that spoke loudly to a generation or an era in time:
Rent
Spring Awakening
Angels in America
"Jaws is the Citizen Kane of movies."
blocked: logan2, Diamonds3, Hamilton22