Actually, I don't think it's unreasonable - and I'm the first to doubt it'll plumb such depths so soon, but if you allow his iteration of week, month and year(s), I don't think Bitcoin is safe from $5k levels once caught in the throes of a strong bear sentiment. One might argue it is at its most vulnerable fresh off the unlikely heights in 2017, and that the overdue correction will turn ugly because it was put off for so long.
Don't get me wrong, I'm still a huge believer in long-term prices, and I'm still wrapping my head around 10k when 10k was my own view for 2020. Not that I like quoting people but Charles Lee even feels we shouldn't be surprised if Litecoin falls to $20 from its high of $350, and if patterns are to be followed by all coins, that's Bitcoin easily back below $5k.
It's not bad news for me at all. I didn't sell at 19k, I wouldn't sell at 50k. I'm holding my modest amount for a long, long time, so any price from now til say 2020 at minimum is just noise.