Elephants and Rhinos in Australia

Just read a  piece in which the idea of introducing wild elephant herds and rhinoceros to Australia is getting serious consideration. 

Here are some relevant facts. Elephants are in grave danger in Africa due to the value of their ivory tusks.  It's even worse for the rhino because of their horns. Poor Africans are willing to risk their own lives to take down an elephant or rhino, as one successful hunt could make a man rich by local standards. That kind of pressure would be non-existent in the outback of Australia, where there is plenty of open land for elephants and rhinos to roam, and few people whose survival might depend on exploiting them.

According to the article, African gamba grass was imported to Australia long ago, and now has proliferated to the point that it cannot be consumed fast enough by catttle.  The fit for elephants and rhinos in Australia seems good. It's not as though the introduction of a large mammalian species hasn't happened before in Australia. The place is home to a large population of camels, many of which are now wild.  The camel is not indigenous to Australia, but as a species it has certainly found a home there.

If establishing elephant herds and rhinos in Australis saves those species from extinction, what are we waiting for?

Here is a link to the story about elephants and rhinos in Australia...

http://www.guardian.co.uk/environment/2012/feb/01/elephants-rhinos-australia-wild-grass