I think it is possible, the same way it's possible for all industries to become ethical and sustainable. The real question, in my opinion, would be "when will it become fully ethical and sustainable". A great example is Patagonia which may not be fully sustainable, but at least they are moving towards that path. Many others will follow in the future as being ethical and sustainable is deemed as the 'new trend' for most corporations, but I think it will take decades before one could certainly say that the whole industry is acting a sustainable way.