Depends on your definition. Mt. Gox can exist forever if they never allow BTC or fiat withdrawals. Do you count that as being "here?"
If they continue to refuse to pay customer funds on deposit, they will eventually be shut down. The longer Gox keeps funds locked down while accepting deposits and allowing trading, the more likely this becomes. Still unlikely.
Okay. Introducing queuing and daily limits for all withdrawals! Now we can say we are actively paying out while simultaneously operating an insolvent operation indefinitely. Cool beans. Learned it from the banks.