I think the issue you're probably getting to is the fact that there is absolutely no commitment in the legislation itself--certainly under the existing legislation, and I think this was a criticism of it--for additional funding beyond the $75 million. I think the courts have held that it's ludicrous that the government would not step in should an incident occur where damages exceeded $75 million.
The new legislation addresses that by requiring the minister to actually table in Parliament an estimate of the anticipated costs of damage. Parliament can then take whatever action it considers prudent.