It would be good start if they conduct BPL when their premium players not playing any important series. Why would anyone watch BBL (except locals) when their own players playing in the high profile series at the same time (For ex : Australia VS India)
Normally that's what they do. The BBL is usually conducted during the December-January window, when normally the Australian team does not play any bilateral series. This year, however this may change. Limited time period may be available and there may be an overlap between the matches of the national team and the BBL season this year.
Oh well, i feel like i am repeating myself here. Yes BBL window is Dec-Jan but they always play international home series at the same time, no matter what, Don't forget about "Boxing Day Test" which is fixed for X-mas.
2016-17 South Africa tour of Australia (Oct-Nov-Dec-Jan)
2017-18 England tour of Australia (Nov-Jan)
2018-19 India tour of Australia (Nov-Jan)
2019-20 NZ tour of Australia (Dec-Jan)