Won't happen.

The main reason protein is highly sought after is that it's an ego/prestige thing associated with excessive self care.

Our diets are very heavily connected to our social status. Being able to consume that level of protein is all about excessive self care.

Fiber is cheap and viewed as a poor person thing. Nobody is holding up their expensive grass fed fiber to brag about the environmental toll it takes, like folks do with their meat and whatnot.

A lot of the protein fad can be traced back to dairy farmers pushing whey into every product they can.