I don't like CF, I think you know that, but even though I don't like the stuff I had to accept it when I bought my Lynskey Ti bike since all it would come with is a CF fork so I got one that was over engineered for my weight by buying a ENVE 2.0 rated for 350 pound rider instead of the 1.0 rated for 224 pound rider, I only weigh 170. My hope is the stronger 2.0 will last a very long time.
Of course I know that CF has made some significant changes in the durability of the stuff but I still wonder about when my bike mechanic friend at my LBS says he won't own a CF bike?! He's been a mechanic for around 20 years and seen all the various materials, and the failure rate for CF has been significantly higher according to him then any other material.
While manufactures did build in UV protection, which they've done for quite awhile now, to prevent brittleness that really wasn't too much of a factor with bikes since the tube shapes are oval and not large flat panels and thus exposure to the sun is much more limited, but they decided that UV protection would be a selling point. However recent studies have shown that CF does go soft over usage and time, see:
https://janheine.wordpress.com/2012/03/15/frames-going-soft/ A lot of this softness is from manufactures not building the CF frames the right way which is to aircraft standard which manufactures don't won't to spend the money to build bike frames like that, see:
View: https://www.youtube.com/watch?v=TpbR-O0J4uE
It's a little disconcerting to me when with CF you have to be extremely mindful of clamping pressures by using a torque wrench; and when I squeeze a top tube on a CF bike and can literally see and feel the sides beginning to cave in, I did squeeze thing with a number of CF bike frames and they all gave in a bit making me a bit nervous about applying too much pressure and crack the tube. The strange thing about this CF stuff is that mechanic guy I know says the older heavier CF bikes actually held up better than the newer lighter stuff, but that older stuff weighed between 18 to 20 pounds which didn't make it much lighter if any lighter then some steel bikes. Read more here:
https://rideons.wordpress.com/2012/04/19/carbon-fibre-care-and-repair/ So really it's the same old problem of lack of proper construction (as that YouTube video points out) that eventually kills a many CF bikes as it did with steel, aluminium, and even Titanium bikes, manufactures are not going to build a bike to aircraft standards regardless of the material used, and so with lightweight construction and improper construction along with bad quality control leads to all sorts of problems with any material.