Thanks for saying this!
It's worth pointing out the economic benefit to whoever invents the Next Big Thing -- if they make it compatible with existing conduit, it can just be pulled through replacing existing infrastructure.
It turns out the only irreplaceable part is the tubes.
Think datacenters, high density offices and apartments, Level 3's long haul links, etc. They will all be looking for a way to pull Next Big Thing like it was fiber.
Fiber optics are awesome now. Fiber optics were awesome in the 2000s, and the 90s, and the 80s, and the 70s...
Quantum fiber isn't a thing. Nobody has even proposed anything to replace fiber with and copper has lasted more than a hundred years. You can get Tbps out of fiber so we should be good for a while. If somebody invents something to replace fiber with, we can deal with that when it happens (probably a hundred years from now).