Methinks the opposite. There seemed to be much more hype regarding the balloon bike craze in the 80s and 90s..
I still have some old newspaper articles from the LA times around here somewhere... there were collectors posting
WANT ads on TV shows for rare bikes....the bike swaps in LA / Orange county here in So Cal were huge with
tons of vendors, tons of parts, bikes and hype. The restoration craze (good and bad as many bikes that
shouldn't have been restored were getting 'make overs') was in full swing with painters and restorers
backlogged with work. And the kicker? Public reaction to the bikes was off the charts even for people
outside the hobby as there were no 'retro' bikes stealing the glory / appeal of the originals. Now here
where I live at least... retro tank and tankless bikes with 2 tone and pinstriped paint schemes from
China and beyond litter the earth blending into the palette of what the eye sees rolling our streets
and bike paths.
Keep in mind Millenials don't really want "Stuff" as they say and a younger audience is not an
easy mark for collecting stuff in the social media / on line world of today.
I'd have to say Mainstream for the bike hobby anyway? had its day long ago... at least around So Cal.
Maybe only mainstream in a sense that balloon bikes started getting imitated 20 or so years back
and saturated the market with 'lookalikes'
retro!