Conclusion:
The BTC price has no real reason to fall, there are no major bad news, I think it's the exact opposite, we got one good news after the other for BTC.
Traditionally we can see that price dropped 20% and 40% after major bad news, currently we are at -13% without bad news!
Looking at the MACD and the RSi we can conclude that the prize will continue it's downfall. Neither MACD is going to cross in the next hours nor is the RSI finding itself in the oversold area.
I think the best interpretation can be made if we look at the 1000$. Same as 1000$, 10k$ represents a psychological level, many investors look at it as a major mark and will sell their BTC and looking forward to claim their profit. An other reason the psychological level consists is due to all the "pro" traders, they tell the novice traders about that magical psychological level and how price may crack down after reaching the mark. Naturally the novice traders will sell fearing for their profit and this will result in a major crack down.
So I would the price will at most drop back to the 7800, which was already a resistance zone, approx. 30% loss after the ATH and represents the 0.618 Fibonacci level.