If it will replace dollar, it wont be Bitcoin, it would be another crypto created from them.-
B] It is a currency that will replace other currencies.
That is not something new, we have seen drops for more than 30 - 35 percent from the all time high, and it is always recovering, in fact, the price is still very expensive at the moment $13,9k.
So, mania "free money, going to infinity" credibility is now tarnished.
If you think that the price will always be stable or high, then i suggest you to sell all your btcs (if you have)