BTC will go to 3k$ by DEC 2019, tons of people bail on it on a regular basis.
This would be a very unfavorable situation for the entire market. And especially for altcoins, whose value would have dropped to very low levels. It would be a symptom of a very big crisis and a loss of confidence in the crypto market.
Unfavorable though very unlikely. As unlkely as the price hitting 20k. A lot of people would be all too eager to buy when the price goes below 6k the same way people are shorting when the price spikes up.