The unique selling point of Nashville Straights strings was that they came uncoiled in long packages. This is a Nashville Straights advert from 1977 which outlines the benefits of uncoiled strings:

Until now, all guitar strings came coiled up in square envelopes. Unfortunately, coiling a sensitive, finely wound guitar string can bend and damage the precision windings, making the string sound less than perfect. Nashville Straights, the first guitar strings sold straight, are made of the finest nickel and bronze alloys. Inside this long, rigid package, the string set is hermetically sealed in plastic to prevent oxidation and promote brilliance and long life. String up a set of Nashville Stralghts and hear the difference, They‘re resonant, uncrashy, loud and together.

I think the extra problems of storing, shipping and displaying strings in these long packages might have cancelled out the benefits.