Basically, they are very certain that the price of BTC will hit some highs (maybe 40k, let's say, or even 19k?), and then plummet to the ground (like 2k or 4k or something).
On what basis other than "Deja Vu" from TA can they make this prediction with any certainty?
What about the fact that nowadays BTC circulation is very different than in 2013?
Things are not like in 2013. In 2013 there was only one exchange, the entire market depended on MtGox's performance, which was absolutely fucking insane. Of course the shithole crashed and then so did the price. Most people didn't even understood that a centralized market crashing/getting hacked is irrelevant to Bitcoin itself working properly.
Nowadays, the market is infinite times more liquid, we have a ton of exchanges, and there is a more widespread culture of how if damn exchange gets hacked doesn't mean Bitcoin got hacked (even if a lot of people STILL don't understand this basic fact).
So no, fundamentals are not like in 2013, and I don't see why we would crash another 90% as we did back then. This dip was nothing but a peanut. Everyday Bitcoin stays above $10000, the harder it will be to go below it.