There is a limit on the number of shares issuable (1,472,540 Convertible Notes with a face value ofUS$1.10, which are convertible into a maximum of176,000,000 fully paid ordinary shares) which means there is a floor (albeit very low) on the conversion price.
In addition, such a conversion may potentially, at least IMO, be used in concert with certain other holders as a blocking stake should another party make a lowball takeover attempt.