Failed like. .... we had huge difficulties reproducing audio through ever complex MC system’s needles, loudspeakers were just so becoming useful, Dolby finally allowed noise free tape mastering, color tv with over 400 lines worked and showed the moon buggy - and yet, to achieve even higher fidelity, a system was created that extracted 4 channels from vinyl and asked people who just invested 2 months salary into two speakers to buy 2 more. Yes, that failed. Surprise. Now audio quality is dead cheap, streams are plentiful and - we are stuck with 2 channels.