Oz could easily rest Tait, Watson, Harris or even Haddin. TP can open with Warner.
You so desperately want India to be knocked out, dont you? What if Sri Lanka beat India by 70 runs? You still want Australia to rest that many people and risk a 87 run defeat which will put them out of the tournament? You might say its not possible with Australia, but this is T20 cricket, an unpredictable format. Any team should look to win their game and Australia are mathematically not yet completely in.