WHY IS IT TAKING FASHION SO LONG TO GET ON BOARD WITH SUSTAINABILITY?

I think fashion is behind on sustainability because like Elizabeth Cline says, "part of it is that we're at peak obsession with fast fashion. Consumers want the absolute latest trend at the lowest possible price. They want to look like what they're seeing on Instagram, and they want it now, and they want it for the lowest price." Meaning everyone wants cheap clothing and don't want something expensive. I would say that maybe the people that are passionate about the Eco-friendly clothing are the ones that would invest their money and time into. From this I believe that not a lot of industries will convert to creating eco-friendly because of all of the money the factories have to spent in and the hours they have to put in to manufacture the organic fabrics, etc. I personally, am not that involved into buying these fabrics. I'm more of a person that buys clothing that fits my needs for a reasonable price.
Picture and Source: http://fashionista.com/2016/05/fashion-sustainability