Three disparate comments:
Old tech like rim brakes are old enough to be naff/passe but not old enough to be 'cool' to most people, hence the restomoded bikes with discs on old frames, but in ten years time people will be grinding off those disc tabs and trying to regain that 'original' oldskool look!
I think we are a lucky generation.. The MTBs which were so exciting and groundbreaking to us lot as kids back in the '80s are clearly outperformed by modern weapons which can now stop on a sixpence (er.. Euro), bomb over big roots and take massive dropoffs, but it doesn't matter 'cause we're all middle aged now so a nice old rigid steely is just the job for an uncompetitive fitness ride through the woods! We match our bikes perfectly!
Why do i love retro? Cause i still remember as clear as yesterday the day i found a row of new Konas at the LBS and was mesmerized by the quality compared to the kiddish clunkers i'd owned previously. Alloy flat bars!
frames that go "ding" (not "clunk") when you flick them with your finger
, more cogs and gears than a Ferrari!
precise, powerful and cool looking brakes
Funky stuff like hotdog bar ends and dogcollars
I literally couldn't sleep 'till i cobbled the money together to rush back and bring home my new MTB. It's just pure nostalgia. I ride the same bike now and i love it more with every ride. Had a modern full suss / alloy / hydraulic / aerorimmed wonder bike for a while recently but it just didn't 'do' it for me. Good bike yes, something to treasure no. Those are the future retro for the ipad generation...