I've never used R2R. My entry into audio was with the venerable 33 1/3 Long Playing Record. So I forget there are people older than me that may have R2R equipment and recordings they want to use. Or have equipment and recordings from their parents.
But, now that records have become cool again, the hipsters will need a new "obscure" format to listen to. I think R2R might fill that role for them.