I think people don't have patience to hold their coins till it reaches to that value and everyone will start selling their coins even if they see price of $1k.
If the price is $1000 next months, then it is OK to sell. If the price is $1000 next year, it is better to hold.
Well I am hoping that the price is going to be at $1000 for the next months or before the end of the year. And if that happens for sure I'm going to sell it.
And if that happens it really means that bitcoin is continuous rising at all.
That's why I'm just continuous holding out my bitcoins for the increase to come in the future.