I think that you missed my point. The original question was if anyone has toyed around, the answer is yes. Then comes the natural question of why - the answer is not "better" or "worse". Carbon fiber is a technical exercize and is merely different. As far as improvement goes, I think that riding in wagons pulled by animals could be considered an advancement compared to the dramatic effects of modern transportation on the quality of air, social interaction, increase of stress........... It would help humanity if they did replace more things "broken". The problem is that they are too obsessed with disagreeing and not dedicated to "improving".
Sure, experimenting can result in interesting answers for questions not yet asked. In this case, I have played the DeCarbo and other carbon fiber experiments (a CF bow for my contrabass for instance), I use carbon fiber rotary valves in my picc. I have a prototype valve cluster that I designed for industrial ceramic or carbon fiber (big advantages for industrial ceramics however). If we look at replacing brass/nickle/silver/wood with carbon fiber there will have to be a reason: sound, durability, weight, cost, manufacturing advantage...... These are parameters that (except for sound) can be objectively evaluated.
One question that has not been asked: can we be sure that no carbon fibres or the polymer binding would end up in our lungs during normal use, after damage? My experience with broken CF parts is that they are like shrapnel. Asbestos was once considered an improvement too..... Before we develop an opinion or disagree, it is useful to get at least all of the known cards on the table.
Manufacturers and techs will need a new skill set when embracing new technology or maybe they just go under. That is not an argument for or against, it is just another reality. Carbon fiber is reality in the DIY world. Model airplanes, model cars, bicycle parts are all being made with a very high level of accuracy. I am not against evolution, some of it is simply not very well thought out.