But is there any reason to think that the pattern will repeat itself again? It's just a belief, there's no fundamental reason behind this pattern, just because it happened twice it doesn't mean that it will happen again. On other markets, no one goes through the history of past cycles saying that the same price movements will happen again at a larger scale.
There surely is not. Bitcoin has been seriously up and down more than twice and it took different amounts of time to recover and reach the new ath. Getting attached to some latest drop before the one we had this year is an empty groundless speculation.
I think it would be interesting to take a look at price speculations from the past now to see whether they were accurate at all. Okay, people mostly seemed optimistic about bitcoin between 2014 and 2015, but the predictions were really long-term, so we still have to wait to check them. But look at this sweet and very far from truth prediction:
https://bitcointalk.org/index.php?topic=1078976.0. That guy thought that a bit more than $1.2k would be great for bitcoin in December 2017! Unfortunately, though, if we take a look at the news from 2014th drop, it seems like people were staying optimistic, while a lot of negative predictions are available now. That's probably because back then only true enthusiasts cared about cryptos and now there are lots of egocentric business people who don't care about anything but fast high profits.