If bitcoin should drop to $1000 or below, I think first thing to do is to find out why such a thing happened, because bitcoin, (considering it's current price and all time high price, plus all the high profile investors), have grown past the stage where it can drop to such a ridiculous amount without any form of negative news backing it.
So for me, first, I will have to know what caused the price of bitcoin to drop that low, what ever the reason is; will determine for me whether I should buy more bitcoins or just sit and watch as the whole magic play out.
Well, in that case, reaching $1k would be the unique opportunity to own Bitcoin, I think many would take advantage of it, and it would have to be a very strong reason for bitcoin to fall that way, because some consider it to be a temporary refuge of value, even many gold lovers prefer bitcoin more, this is because of the tremendous start it has had and its acceptance worldwide, we also see that in the traditional economy anything can fall, the stock market, stock market and every market that is supported under a backing, here the only backing is the supply and demand, as well as the whales and all that make BTC life.