You and everyone else predicting it since it was $200.
On the other hand, Bitcoin was also priced under $200 just over a year earlier, in November 2013. In December 2013 it spiked over $1000 before crashing. The $200 in January 2015 is where it eventually stabilized.
This doesn't invalidate your comment, by any means, but it does illustrate that such a collapse is not out of the realm of possibility.
(All prices sourced from https://www.coindesk.com/price/)
Study currencies, stocks and commodities price histories before and after they entered parabolic phases. Nothing lasts forever.
Right. Except the ones that do. And even if you correctly predict that BTC is going to collapse... when? At $2000? At $5000? At $7100? Are you doing anything to bet on it by shorting it? Or are you just prognosticating and trying to timestamp a comment so in [x] months/years you might be able to link back to Hacker News and say: "A-ha! I knew it," ignoring all the other predictions you may or may not have made that didn't come true.
It's easy to say BTC is going to collapse. A lot harder to have some conviction behind it and act.