Even the Wall Street Journal is considering this rumor:
http://blogs.wsj.com/moneybeat/2014/09/19/bitbeat-more-pain-for-bitcoin-prices-are-chinese-miners-to-blame/Excerpt: "
Still, it is the China theory and it is only a theory that is most intriguing, in part because it explains a striking anomaly in the bitcoin system: That the summer-long price fall has coincided with an explosion in bitcoin mining. Over the same three-month period in which the price dropped from above $600 to below $400, there has been a doubling in the hashrate, a measure of the network-wide computational power with which bitcoin miners compete to solve a mathematical puzzle and win the right to a fresh issuance of 25 new coins at 10-minute intervals. Theres an arms race going on in bitcoin mining. But that begs the question: why would anyone rush to buy mining rigs and pay for ever-greater electricity consumption when both the proportional share and value of the bitcoins you can earn are plummeting?"