The answer is No. Derpy, you survived the...incident arround season 2 and 3, and as long as there is people rewatching the show, maybe once, or twice, even more, people does draws or even going with the comparsions of G5, you will remain. Maybe even in those anniversaries rereleases when you appear again, for one thing you are there among the flagship characters of the show. And when the show is over, the fans will just continue the legacy...but as long as everyone remembers your name, you wont fade Derpy