Just because a big drop, doesn't mean over.
Its over when user base has completely move away.
That won't happen in a short time, even regulation cannot control crypto completely.
Sometimes, statistical analysis is not enough to think that bitcoin is totally falling to its end. As we can see the price of bitcoin is still gradually recovering. Bitcoin's price is still high, and still a best choice for investment. So it is baseless to think that bitcoin is over, due to the 50% slide on price. It happened before, yet bitcoin still manage to bounce back even in a stronger value.