Ten Technologies That Refuse to Die
Despite all the advances in in technology and manufacturing, old musical gear still reigns supreme in many areas. A vintage Neumann U47 mic (like the Beatles used) fetches a tidy sum and sounds better than most anything made these days. They don't make the exact replacement vacuum tube for it anymore, but there are close substitutes.
And speaking of tubes - the rich nonlinear sound of a tube amplifier hasn't yet been replaced by a more modern equivalent, especially for electric guitar. I think one of the articles mentioned vacuum tubes.
Piano, horns, guitar - most all acoustic instruments have nice sounding synthesized sampled versions that can be had at a fraction of the cost. These can be played from your computer or a keyboard. Yet the physical instruments, as expensive and potentially out of tune as they are, will probably always be preferred because of their human interface. Similarly, drum machines, which do not show up late or steal your girlfriend, are not replacing human drummers playing acoustic drums, except in 80's music and certain "techo" genres.