Long before there were automated carpet mills, carpets were dyed by craftsmen proficient in the art. Today, only huge carpet mills dye carpets for distribution to carpet retail outlets.
All carpet is dyed.
On-site carpet dyeing and color restoration as a business is less than 10 years old with rare exception. It is one of the few services that has been created by consumer demand, not by industry or technical creation. Carpet retailers and the carpet industry certainly benefit more short term if consumers continue to buy new carpet. If you do the cost analysis of the benefits of better quality carpet is actually costs far less annually to own and maintain than the cheaper carpet. Nearly every carpet cleaner has attempted to start a carpet dyeing business.