Fender only followed car color trends in the late 50s and early 60s. After that they went their own way (including natural wood bodies and many "interesting" color choices of the 70s.)
Most Fender guitars sold today are still in those "custom" Duco colors from the late 50s and early 60s. (The standard Stratocaster was a burst color and the standard Telecaster was butterscotch or blonde. Any of the Duco car colors back then was a "custom" option for an additional charge.)
I interviewed their #2 guy for a radio show a few years ago and he's the one who gave me that info. In fact, they follow lots of other color trends--right up to and including women's shoes (not joking). I called him out on it and he said, "Do you have any better ideas?" and that shut me up really fast.
Most Fender guitars sold today are still in those "custom" Duco colors from the late 50s and early 60s. (The standard Stratocaster was a burst color and the standard Telecaster was butterscotch or blonde. Any of the Duco car colors back then was a "custom" option for an additional charge.)