I literally got a tech support call last week asking, "How do I legally get MP3s to put on this new MP3 player I just got?" I was kinda stumped. "Umm... Rip a CD?"

Fax will never go obsolete because of the medical system.

Brit here. We (the household) had our landline switched over from analog to digital last year so if our internet connection drops out we won't be able to use the landline. the reasoning was the phone cables are getting old and the government doesn't want to spend money to replace them so landlines just connect to the router now. i know landlines aren't obsolete but the technology which made them redundant is, at least in my area. the rollover is expected to be completed by 2027 iirc

I don't see landlines going away for a long time. Most residential doesn't need either of them, but commercial will absolutely be using them for a long time. Businesses and corporations get a huge advantage from having phones that are so reliable. They don't need to be charged, they never have to deal with poor signals, and they are cheap to replace of broken.