Bill is currently before the Senate with the Committee to report by 9 May 2017 (ie Budget night). This will highly likely be passed unless Labor think there is enough political capital in opposing.
I do not blame Ebay, or any other foreign retailer, for opposing legislation that would require them to withhold GST and remit on behalf of another party. Apart from the cost associated with compliance likely being extraordinary, it is ridiculous to think that this measure will actual result in enough revenue to make it worthwhile.