CDs have indeed been replaced for anyone below 30. Radio still offers a group experience not matched on the net, and you can't get internet radio in cars, but I wouldn't buy radio shares. Faxes are obviously old technology and will disappear when the software is easier to use. Mail will be around for as long as we respect paper docs above electronic ones but the transition is well on its way. Don't know why you thought trains would be obsolete.

These things take time, but change is unambiguously, if slowly, in progress. Just wait!

I don't like radios. I want on-demand, 24/7 access to ANY music I want, ANYWHERE I want it. A radio can't do that, a mobile device, in theory, can, while also offering everything the radio offers (for example, see how many radio station apps there are on the iPhone).

Television as a physical device is unlikely to be replaced - you can't beat a big screen with big sound. I don't like Television the medium, though. The sooner it gets replaced with true on-demand media, the better (again, nothing preventing it from keeping the existing "all you can eat, no thinking involved" model as a subset).

CDs are definitely on their way out.

Trains are a different story - many people argue that we should use trains more, not less.

I HATE dealing with faxes. Of all the archaic technologies that deserve to die, faxes are at the top of the list. Many people use services that send incoming faxes directly to their email, anyway, no printing involved - why bother with the fax then, and not just simply scan and email?

Mail - bills and junk mail, possibly magazines (another thing that is apparently "dying). Mail has become extremely marginalized.