I'm not an expert on this. Right now this looks like there's lots of stuff for math and physics nerds to get excited about and not much else. Certainly words like "quantum internet" sound like complete bullshit designed separate investors from their cash rather than market any concrete products or solutions.

All I'm hearing in terms of practical applications has exclusively to do with hardening cryptography: safer ways to do key exchange basically. That's nice and probably desirable long term but doesn't sound like it would cause most people to get really excited about buying new computers and connecting to a brand new "quantum internet" any time soon. As it is they barely notice or care about stuff like https and equate the google search box with the internet.

This crypto hardening would only be needed when quantum computing compromises existing algorithms. So far, that is not yet practical to do. It seems we first need some practical quantum computers that compromise security in a way that could feasibly be used by malicious parties. I'm not talking proof of concepts, I'm talking actually broken keys. My guess is that this is either impossible or stupendously expensive to pull off and will be for the foreseeable future.

Once this happens, there will basically be an arms race to upgrade existing algorithms and deprecate the broken ones. Given people still happily use known/suspected compromised ones today, I imagine this will take some time. Decades basically.