Tubulars may be the only commonly used bike part that if introduced today, would fail to catch on.

Inventor: "Hey, check out these new tires. They feel incredible and you can inflate them to 3,000 psi"
Cycling world: "Sounds awesome, I'm in. Let me try a pair"
Inventor: "Here ya go"
Cycling world: "Uh, how do you get this thing on the rim"
Inventor: "Oh, I almost forgot, here is some glue. Slather that on your rim over the next 3 days and you will be ready to go"
Cycling world: "Geez, look at the time, gotta go. Good luck with your invention, I'm sure it will be a big hit".