We know that bitcoin are important to us, what will be the possibility to happen to you or to us when bitcoin is gone?. For now bit coin is one of my chance to make my dream came true, I want to be rich someday, but when it gone, my dream will be ruin.

Lets talk about blockchain here and not just about the bitcoin only. There are 1000s of crypto currency available nowadays. It's not just about bitcoin. It is just the pioneer on blockchain and hence most popular among others. So even if bitcoin is gone, another new currency will pop up quickly to take its place. That can be anything like Ripple or ETH or may be some other coin. So if you are an investor of crypto currency, I would suggest you to start diversifying into other coins as well.
Remember, a magazine like Forbes recently listed out the top billionaires of crypto currency (not only bitcoin) and the top position has been awarded to Mr. Chris Larsen, the former CMD and co-founder of Ripple. Even the second place has been awarded to Mr. Joseph Lubin who is the co-founder of ETH. Bitcoin couldn't make to the top position.
So open up your mind and invest in different assets. Because no one knows what future holds for us. If not bitcoin, there will be other coins to make us rich and to make our dreams come true.