Here are some scenerios that can cause the price of btc to fall drastically. (In my opinion, it is highly unlikely and the possibility very slim).
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One day we are predicting the Bitcoin to rise to $100,000 or $400,000 and now we are talking about it falling to zero?
As CZ Binance once said, "As Long as I Have a Penny Left, It Won't Happen."
And the fact that the price of Bitcoin has been slowly rising in recent months goes to show that Bitcoin is not a bubble and is likely to be around for the long term.