This can happen to many altcoins out there. But youre talking about the father of all coins, it can drop to 1 usd and will come back to its value again and again.
It is normal for people here to expect impossible like what they know and what they do understand because many of us here have learned this over the years that Bitcoin is here to stay at least for many years more .
but knowing altcoins and bitcoins movement since then , I must admit that sometimes I have that thinking but never come to realized it will happen , dropping to zero meaning the end of the use of cryptocurrency.