This first quotation doesn't properly answer your question, but it contains an interesting hint:
Jean-Philippe Rameau, the leading French composer of the 18th century, also contributed much to the development of orchestration. Rameau, like Handel, was principally famous as an opera composer, and the overtures and dances of his operas represent the most advanced uses of instruments during that period. Rameau was probably the first composer to treat each instrument of the orchestra as a separate entity, and he introduced interesting and unexpected passages for flutes, oboes, and bassoons.
The Traité was immediately recognized as a profound advance in musical theory, however, and it established Rameau's reputation as a theorist. His book was the first to codify those principles of tonality that were to dominate the music of the West for almost two centuries. Even today the theories of Rameau remain the basis for the study of harmony.
The question means if his work made music more accessible to the public and therefore greater demand to produce less expensive instruments -- perhaps with metal instead of gut, such as frets, using less materials, etc.
I'd rather say that no!
The points you are mentioning might have been more an impact of the French revolution in general when the music culture baceme not only a pleasure and privilege of for the nobility (apart of the travelling artists in the cities) but for all citizens - at least for the bourgoisie, as before the French nobility (French: la noblesse) was a privileged social class in France during the Middle Ages and the Early Modern period to the revolution in 1790.