The way it is now is that if you're in Gold tier, the lowest you can go is Gold 3 and you can't de-rank into silver if you lose 20 times etc. Once you reach the next tier, that's where you stay.
I think ultimately de-ranking will bring a hell of a lot of toxicity into Crystaline Conflict and will just push people to Casual. PvPers get pretty upset when they lose rank / status.
