I think you are right on. This is how fiber optics gained their foothold in the communication space. Coax was reaching its limits in terms of transmission amounts and cost of improvements, but people were skeptical of switching over to an unproven medium due to the many different technologies that had to come together to make it work (fibers, lasers, semiconductors). It took many iterations of fiber technology and many years, starting with "large" graded-index fibers with laser-based repeaters to get to tiny single-mode fibers with optical amplifiers.