No, it was the way some understood it, no one ever claimed, fiber optic would be used for current, at least i never heard it, FB is used for data, its use will only increase. i see it in modern cars, even non luxury brands. My passport has FB data bus for infotainment system,
pretty much everything bulbs do leds do better, they make more light per watt, they make less heat, more compact... you get the idea, after all we are on a flashlight forum. light and its sources is literally the subject of the forum.
as far as manufacturing, does not matter, they are made by literally trillions worldwide, from huge arrays to tiny ones with a chip as small as a smallest grain of sand, and its production and development only grows, bulbs factories otoh disappearing. very soon there will not be any left, Pretty much all toys today that light up use leds, not bulbs. used in ways that would be impossible for bulbs, and you are telling me that they are too expensive for cars??? yea, sure.
Thou i have no doubts Some bulbs will be produced for a very long time, but its use will be limited to highly specific applications.