Originally Posted by cafzali

Manufacturers are swapping them over on high-end models because they know that a certain segment will buy them. There's no assurance that would happen on other models. Manufacturers like to try and have the tail wag the dog, but the consumer is the ultimate "boss" in terms of what gets adopted. If they don't want them, they won't spread across all models.

There are clear advantages to modern drivetrains and other advantages that just aren't there for most people in terms of discs. America perhaps more than any other country in the world is obsessed with the concept that a new advance has to mean the death of something else, but if you look at history, this has rarely happened -- especially in areas where gains are marginal for most people. This isn't like HDTV versus standard definition where there are compelling advantages.

This is at best a marginal improvement for most riders and people don't go out and buy a new bike for marginal improvements unless they are going after high-end models. That segment will likely get them en masse because a certain percentage of the population loves to spend money just because they can.