I think bitcoin will exist as long as the blockchain technology exist. To get out of the business people need to stop using it. But i dont think those who are in involved with some work which requires the attention of being secured while making the transection in sense maintaini extreme privecy at the prime  will not stop using it.
Now the thing is whole system is corrupt. Unsual dealings or unlawful dealings are happening. Somebody is getting caught while transfering local currency into other country without banks permission makes it illegal. But if they buy btc and transfer money. Nobody gonna knows it.
And btc is the most powerful project of blockchain tech and trusted by the users.
So i dont think it ever gonna stop.