Being a brony is not a fad. The show is not a fad. A fad is something that lasts for a short time then slowly disappears until no one remembers it. Have any of you been paying attention to how large the brony community has grown? It's like an entire different world on the internet.
Their are so many forms of art, music, games, comics, fan based animations, fanfics for my little pony. It would make no sense if it just died one day.
I view the my little pony fandom like a brand new sports car that is owned by everyone. Everyone takes care of it and customises it so it can keep running smooth. Now why in the world would you abandon this sports car that you've loved for so many years and let it rust and die?
sure some people will leave the brony fandom some are probably leaving right now but my little pony will never die unless you want it to. It will only die if you give up.