I don't think the $666 number will hold as much as in the past due to this being lead so much by the Chinese. It might struggle to hold there briefly but after that, sky's the limit.
What's so special about it reaching $666? Apart from it being the number of satan, is there any other significance in this?
Price stabilised there on the way up and down due to a small minority using it to make a point or for giggles. Other traders used that to their advantage one way or the other.
Volume will be too high for a small amount of people to be able to hold it very long unless the psychological significance is used by traders.