A lot of the wall could be fake, we've seen many fake walls come and go. That's the caution you need to take with these unregulated markets, an individual could easily place a fake bluff on either side to manipulate price movement, remove the bluff then take action once price has shifted.
I'm quite sure short-term fake walls exist. We've all seen them in action. But a lot of people seem to have this idea that a large portion of the total mtgox order book are "fake" as well, put in there only to give a skewed impression of the market.
Problem is, all orders in the book are funded (or should be, in principle), meaning that whoever wants to manipulate the market long-term in such a way better has a few million USD lying around that he doesn't mind sitting in the mtgox order book, week after week. Gaining no interest whatsoever, when they could be put to use in other markets. And taken care of by a company that has a more than spotty history of reliability. Yeah. No way that could possibly be a bad idea to do.
. The 7 weeks have been calculated by me to make it a total of 2 month for that downturn.
