Just to give you an understanding of what that's going to do to the price... there are only 250K BTC on the order book right now. Now, don't get me wrong, there's lots of money on the sidelines, but think about what that means... It means that big BTC whales are currently UNABLE to cash out. So they are bleeding into the market slowly to try and keep the price from crashing. ...and that's why this downturn is going to be so long and so painful...
I really don't know where are you getting your figures. On Gox's order book there are slightly less than 120k BTC ATM. All time high in terms of BTC at Gox order book is slightly over 300k BTC, and that happened end of August 2012.
So, even if it was true that we had 250k BTC on Gox order book now (which it isn't), you shouldn't say "only", because 250k BTC on sale on Gox would bex a HUGE quantity, very close to ATH. Just remember that there are only 11M BTC circulating, when you have 2,3% of the total supply of BTC on sale on a single exchange you do not say "only", and you do not expect more to come.
And BTW, BTC whales are not "currently" unable to cash out. That's BS. Cashing out many k's of BTC has always been a problem, and today is a much smaller problem that it was let's say in January. This is a super tiny market, it has always been, and cashing out k's of BTC avoiding massive slippage has always been a lengthy process - in the past more than in the present.
250K on Clarkmoody right now if you group by BTC0.1 and look all the way to $11. My contention is that since there is so much less volume on the exchange now (due to the cash inflow/outflow conduits being closed), then selling large amounts is much much harder. In any case, the whales make one story very clear - the vast majority of BTC is not in the Bitcoin economy, it is in the hands of speculators, and those people will dump when they see a persistent downturn. Initially they will try to control the price to maximize their exit return, but ultimately they will trip over each other selling their BTC, and we will be right back where we started this year...
You are reading it wrong. To be very precise in this second there are 120,86k coins in Gox's order book (it may have changed significantly by the time you read this post). If you want to see a graphic representation, see the graph below. You will see that indicates slightly more (around 125k), because quantity on the order book changes pretty fast.