Naive question here.

Over the last few days, I've noticed on bitcoinicity that the number of bids/asks on Mt.Gox has become really small, as some other folks on this thread have pointed out.

I don't really know what that means, though. I mean, I guess it means that that's the total number of bitcoins currently for sale/to be purchased. But I've never seen such a small number of available/wanted bitcoins.

Does it mean that we are likely to run out of bitcoins to buy/sell on  Mt. Gox?

And right now there are no bids below $138. Does that mean that unless more bids appear, the price can't drop below $138?

Thanks.