Unfortunately, the opposition is also backed by the CFMEU (Construction, Forestry, Maritime, Mining and Energy Union) which includes the Mining & Energy workers.
As such, the opposition isn't likely to take action that threatens the jobs of union members.
The other thing to remember is that minerals dwarf all other parts of the Australian economy. Turning off coal will tank the Australian economy, this represents a real challenge for any prospective government.
We've already seen what happened to the Australian dollar when China's northern port of Dalian banned imports of Australian coal and will cap overall coal imports from all sources for 2019 at 12 million tonnes.
Australia rapidly needs to grow other industries. An obvious place to start would be to recreate the manufacturing industries that have all but been destroyed[1].
[1] Written as someone with an electronics manufacturing business in Australia.