if that will happen i will buy bitcoin as many as i can. because i think all or maybe many of us has same mindset like me
Are you sure ? If bitcoin price dropped to $1, something big must be happened and makes people to not use bitcoin anymore. If you buy bitcoin on that price, it might have a big risk to do that.
I am pretty sure that if the price of bitcoin is going to drop to $1 many investors are going to buy a lot of bitcoins especially those people who are believing with bitcoin and I know that they are going to buy as many as they can as long as their budget is enough for it. So that it can give them good profit when the price is going to increase.