Vacuum tubes still have at least 1 job where they're vastly superior to transistors. For example, ask almost anyone who plays guitar if they'd take a solid-state amp over a tube amp. Almost all of them will say "Hell no!" (though some prefer the sterile crunch of solid state). Tubes sound better, and it's not just perception. It's measurable.
I can't confirm this one personally (I have many records and even buy many new releases on vinyl, but no player for them yet), but records are also supposedly superior when it comes to sound quality.
Some technology never completely goes away. It might get "almost completely replaced" by something newer and better in "most" applications, but as long as there is something that the older tech is better at and there are enough people who want to hold onto it, it won't completely go away.
I also agree that PCs are here to stay for the foreseeable future.