i'm not so sure it's lack of interest in bikes as it is lack of funds.
Hell, i've got a very good job, a nice home that's a few years from payoff, no credit card debt, yet I cringe looking at some of these bike prices. Hard to justify the funding especially in the snow belt where I live. You could say I'm 'well established(otherwise known as old) but I have a hard time looking at 30,000+ sedans, 45,000 SUV and 60,000 pickups.
Let alone 20,000+ motorcycles.
And lets face it, probably half of the upcoming generation is too busy playing call of duty to be concerned with going out into the sunlight.