We still maintain our banking relationships and have never maintained a fractional system on coinsecure, so, all fiat funds were always safe and withdraw-able.
Are you sure that allowing for withdrawal of fiat funds is the right approach to be followed?
Sorry to bring up an extreme scenario - but what happens in the case of a liquidation? All creditors of Coinsecure (i.e. customers) should have equal access to the left over assets. It shouldn't matter whether customers have stored assets in the form of bitcoins or fiat, and what is the form of assets which have been stolen.
The above approach is what has been followed in the case of other hacks - including Bitfinex.
If Coinsecure is able to absorb the loss, then the approach followed really does not matter.