Lawsuits are the standard instruments that customers are expected to use when a company defaults on their contracts. Why are MtGOX clients so reluctant do do the natural thing?
Because we've been through this before with Gox, again and again. Whether they pull through this time is yet to be seen.
Surely you must know how expensive and time consuming a lawsuit would be.
If you haven't heard, this community is a wretched hive of scum and villainy. Scams, "investment" schemes, failed ASIC group buys, miner preorder drama, pump and dump coins, and other various flowery-sounding get-rich-quick schemes have come and gone long before you. However unfortunate, it does ensure that Bitcoin is not adopted by those who can't comprehend basic computer security by making a shining example of selected individuals. Stick around, though, and you'll see how fast we grow.