I don't agree that in 6 short years that having older riders on the road will make motorcycling unpopular. But I guess only time will tell.
Back in the 60's/70's, motorcycles had more of a romantic coolness factor (the bad boy image) which drew a number of younger riders. I recall our HS parking lot had almost as many motorcycles as cars. I just don't see that rider romanticism in younger gen today.
I also recall how a number of college students owned a motorcycle as their only means of cheap transportation back then.