Portable media changes... but can you honestly say that's bad? We've gone from ancient LP to wildly inefficient 8-track to cassette to CD and now to digital distribution... but you can still buy LP players if you need them.

AM/FM radio is not obsolete. The fact that most of you know who Mo Twister and Grace Lee are is a good sign of this.

SD TVs are not obsolete. The only problem with 80's receivers is that you won't be able to watch all 100 cable channels, but bridge-technologies like cable boxes allow you to watch cable on even the oldest TV sets.