I see the current "bike boom" tailing off at some point but lasting longer than the boom in the '70s prior to the switch to jogging and rollerskating (perish the memory).

Classic/Vintage will be newer () it is a fluid state as expected. When I first arrived here in 2004 I had just bought an '85 Trek 460 racer for 75.00 and posted in this C&V forum inquiring of the bike and value. At that time the bike wasnt really popular, desireable or valuable, it was just an old Trek. Not now.

My outlook is that the baby boomers are largely contributing to this current surge and who knows where this thing is going in the next 15 years.