Let's hope this was the last bunch of desparate taxi drivers who bought at 20K and dumping at 13K 

Since cost of production is $3k, and bitcoin doesn't actually have a finite supply in practice, but an infinite supply when transaction fees are recirculated as block reward, the price should therefore always trend towards cost of production if bitcoin was actually a decentralized system since you can just mine it yourself for $3k instead of paying someone else $13k. In GPU altcoins you notice this effect very fast. The fact that bitcoin is still this high above cost of production is just a symptom of how extremely cartel centralized it is.
But there's still likely a handful of non-cartel stray miners that will cause the price to implode back down near cost of production, just over a slightly longer period of time. This of course assumes the entire bitcoin price isn't one giant tether scam where they just print infinite amounts of tethers, eventually imploding in some sort of MtGox^2 *cough*.