I do not think that it will fade that easily. Maybe tommorow we would not use blockchain but some other implementation of blockchain idea that is far better with it's capabilities. Many new things can happen and turn around within next 5-10years. Big companies are trying to extract and look only at the part of blockchain tech because then it gives them the ultimate power within their centralized systems. I do not think that cryptocurrency will be forgoten that easily.
I see your point, so what are you try to explain is: As long as those companies are existing in the world, yet the cryptocurrency will not be easily vanished cause they still have some value?