To be very transparent, there is a limited bitcoin supply and even if lot of bitcoins are moved from old addresses, there is nothing to panic about. We do not need to speculate anything. Moving bitcoin could means that bitcoin may have changed hands and that's it. Bitcoin supply hasn't increased due to this, right , wo why getting panic ?

Also i see people getting worried about the Mt gox bitcoin distribution will cause big selling, agree there can be selling pressure for some time but then again bitcoin will move from mt gox weak hands to strong holding hands and total bitcoin supply will remain same. The demand for bitcoin wont be less.