One thing I WILL miss when they are gone are Minidisc player / recorders -- I'm still using (and loving) the MZ RH1 -- beats ANY IPOD with mp3's -- much nicer quality sound - and can RECORD as well -- great for music gigs, lectures etc etc.
Hi-MD minidisc will record 7 hrs at lossless compression - but you can still use higher comression rates for lower quality sound / speech etc longer play times. (for PCM / WAV recordings you only get around 1 hr per disc - but in a gig that's enough for a demo)
You can of course use ATRAC lossless for around 7 hrs per disc but it needs a bit of stupid software to get that codec into more common codecs that other players will recognize .
(Atrac lossless Sony propretary lossless compressed codec 99.999% as good as CD standard- but you need software for decoding the codec - supplied of course with the MD).
MP3 etc are LOSSY codecs.
If device gets broken / lost you don't have to re-digitize your collection / find it again --just pop another disc into your new player.
Journalists out in the field still use these - just try changing a tiny micro SD card in the middle of a howling gale or when you are in the front line reporting a clash between protesters and fully geared up Riot Police.
Enc pic of the MZ-RH1. Has a common analog / optical input too for lossless real time recording.
A device much appreciated by professionals but unfortunately not really supported by Sony in the way it should have been. (And it did have some rather stupid software).
Enc pic -- was a bit "boozed" when I took this however.