You're making several incorrect assertion. First while carbon frames are largely marketed at the expensive high performance crowd they are not very expensive to make (for example the production costs of top of the line specialized or trek frames which sell for 3000-5000 USD for the frame only, have cost including shipping to the US of approximately 300 USD). Second every professional cyclistbis always limited by their physical abilities, compared to many other sports, material has very little impact on the performance of pro cyclists. Mind you they still take that 1% gain because it can make all the difference between a win and a place in the top 10.

There are also significant amount of carbon commuter bikes around by other companies so this is nothing new. Particularly the prices of e bikes are significantly due to the motor etc.