I don't think bitcoin is going to fall, but I agree that it is necessary for bitcoin to correct a bit, to shrug off weak hands, and start heading towards new highs. I do not think bitcoin is a threat for the dollar..
That's quite true, a correction is always needed if an asset's value increases way too much in a short span of time. The correction is done so that the assets value increases with more stability and others get a chance to buy it a market price. Bitcoin is at reasonable price now and I think many are buying it these days.
Bitcoin is never a threat to dollar, not only dollar but any currency. People who say its a threat should look at the technology it has and the way it runs.
But the thing its not the people but the government who think bitcoin is a threat to them, financially and in the economics of their country. But if they would just look closer at how bitcoin works, they can find positive thing about it and it is not threatening anyone. But they think otherwise, they consider bitcoin's decentralized as one of the factors that they are afraid of. No one is in control, no regulations whatsoever. But they really deny that fact that bitcoin is taking the world by storm.
If a country chooses to ignore bitcoin, then they will be left behind. Bitcoin is not fiat's enemy, but they can work together to improved the lives of many people that depend on bitcoin.