I think the technology topped-out about 15 years ago. As for younger riders, I think they'll come around once they get some more years under their belts. I can easily see some huge C&V events in say, 2050, but they will be attended mostly by riders who are in their 40's and on.
I think it would be a bit too much to ask any teen or 20-something to ride anything that isn't hot-off-the-press. The song remains the same.