Why? Since we just had a huge bubble, I'd be very surprised if we're not in an actual bear market by now. And if so, it's likely that the price will move similarly to how it did in 2014-2015, but in a higher price bracket.
If you follow the long term pattern of this market, and then mainly after the MtGox drama, the market has never dipped below its base bottom, and I am fairly sure that we'll maintain that pattern, even after the insane bull run that is currently deflating. It's of course not a guarantee that it won't get broken through, but it's something the market definitely pays attention to. If we do end up dipping below that level, then it just points out how empty the bull run of last year has really been. If the market won't even be able to sustain anything over $6000, it will likely deflate further where nothing will get spared. It's not that current levels aren't somewhat justified after the increased adoption, increasing regulations, etc.
Another factual bit of information giving my theory value, is when we look at the bottom before the bottom early February. Bottom November last year $5555, and the bottom in February $5920. If we look at how much panic was flowing through the market, it would take 10 minutes to dump the price below the $5555 bottom, but it didn't happen.