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Bter gave everyone IOU coins to cover the losses from its hack. Unfortunately it only made one or two tiny repayments then stopped paying people back. It's still running but it has very low volume now. Finex might find it can't afford to buy back IOU coins if it loses volume. It could become a zombie exchange like Bter.
Those are good points, and a couple of points. First, Bter had never reached as large of a level as bitfinex, so bitfinex would likely be able to fake it until they make it longer than Bter. Second, I think that the punchline for bitfinex is coming up with a plan that seems plausible and will attempt to minimize the loss of confidence in them.