There seems to bit of information around at the moment on mistletoe. A recent meeting of the Ballarat Australian Plants Group heard a talk by Peter Rogers who has developed a good understanding of many of 90 Australian species. The latest Wombat Forestcare newsletter also has an article about mistletoe.
Despite the concern that many people have about them, mistletoe is part of the environment and provides a lot of benefits to a range of species and are considered by some to be a keystone resource. The brush-tailed possum is one fauna species that does eat mistletoe and also requires hollows for breeding. If you are in an areas without many trees that are old enough to have hollows you may like to consider putting up some nestboxes to encourage more possums and other hollow dwellers