With constant speculation about the value of bitcoin, China claiming to ban exchanges of bitcoin, and some banks trying to create their own blockchains for their countries, What will happen to bitcoin if this become true? Will it be still used ? will it not be worthy anymore ?
That's quite impossible. Try to compare its market value from now and then, it is way far from its price before and as its price is increasing through the years that have passed, its community became larger. And with that its community will be the reason why it won't decrease too much because they will provide the market demand. Since the market value of Bitcoin is dependent with its demand, as its demand is rising its market value will also be. So it is impossible in my opinion.