Mountain bikes and hybrids later on, replaced much of the road bike market. Road bikes have made a comeback, and now there's a good bit of variety in the commuter bike world. Steel is back in demand for a lot of bikes.
I wish kids were riding something other than mountain bikes. The flat bars are good for control but the front forks make the bikes heavy and the knobby tires on pavement are just plain wrong.
My granddaughters will of course ride only cool bikes.