In answer to the question…in the US, it depends upon who wins in November. If Hillary, then we expect it sooner. If Trump, we expect it later.
When will Australia and the United States be allowing this? “Nigeria’s National Assembly is considering a change to the country’s constitution that would expand the scope of jurisdiction of the country’s Islamic Sharia courts of appeal. Currently, the constitution limits those appellate courts to matters concerning family law. If approved, the change would permit Sharia appellate courts to take up criminal cases, some of which carry the death penalty, arising from lower Sharia courts. Christian churches in Nigeria say the proposal is a step toward Islamizing Nigeria.” https://www.worldwatchmonitor.org/2016/06/4494845 Be prepared it will happen.