There will always be retro addicts, but in decreasing numbers. I mean did you ever try and mention a C64 to your niece or nephew? Their retro means Sega Genesis, maybe even Super Nintendo. Most have no interest at all and beevr will be exposed to what we grew up with. Or at least those here old enough to have bought a C64 or Amiga new.
Also the new kids today interested in coding demos will do so on the new hardware which provides tremendous firepower and overabundance of utilities to get their wildest creations done and reach the widest audience.