Even if they ever do....it will be a race to the exits...and then collapse, withdrawals resuspended.
That assumes they aren't simply buying back the XBT they sold during run up that they never had and once finished they'll reopen and pretend nothing ever happened.
Good luck to them. Remember just because MTGOXbtc is there in their database, doesn't mean it is accessible for them to actually buy at those $200-$300 prices.