Changing eras. It might also need to be considered, that young men pre first world war were still living in the age of horse drawn conveyances. Motorcycling was a new phenomenum and their introduction would have been influenced by the machines that were used during that conflict, and that many did not return. Those that did enjoyed some freedom of transport that was developing, but which also saw many manufacturers going to the wall. The depression years were hard for everyone, but the desire for new models caused manufacturers to take on more risks, and so development advanced if only slowly. The sidecar became the people/family carrier, for a while. Then another conflict taking its toll on life. Those who came back needed cheap forms of transport, the motorcycle supplied it. Then came periods of time when cheap second-hand cars of the thirties and forties took on the means of getting about, though the children of that generation sought a form of excitement - Speedway! And motorcycling got into the blood of many, as it did with the Baby Boomers on apprenticeship schemes with little money but big ideas. Then along came the Japanese bikes, and 'we never had it so good' with rear view mirrors, flashing indicators and fewer oil leaks. Time marched on, and for a while the battle of the big British bikes parried with the Japs, but we never really got the machines that could have been produced due to political wranglings and corporat take-overs, the Japs cleaned up.
Then came fashion. Dolly Birds, short skirts, Mods, and better wages saw small cars take off for many, ousting the dirty oily bikes to caff forecourts and trade-ins for four wheels as wages improved and families grew. By this time the 'die-hards' clung on, keeping the old irons for weekends while keeping the family happy with a motor. The corner shop and the caff were swept away by the supermarket and the 'wine bar', bikes were for a receding hairline generation, living on nostalgia, with the exception of those who got involved in engineering and making things go faster or just better. But in the main, the Hot Hatch, the Granada, the Sierra were first considerations for many.
Then came the Born Again Bikers, hacking off down the roads on machines with more power than the riders could handle when wages improved. Age for some brought inheritances, or successful business ventures, and the dreams of youth became realities, while the youth took to Twist 'n Go, or a Golf GTI, 'rides' got 'pimped', and legislation became a dirty word - still is, and ongoing. The future? That belongs to those who can afford it.
The real essence of motorcycling has, and will always belong to those fascinated with machines that can be dis-assembled, rebuilt, and kept running out of inginuity and mechanical accomplishment. The rest will need to rely on some computer geek to keep their cages on the road. Which brings the thought : cheap small bikes economic to run might just fulfill a need of the mortgage strapped, parking fees constrained, needing to cut costs. Who knows.