Scenario 2:

For all the Indian fans who are badly wishing their team to occupy the top place leaving Pakistan behind, sadly Team India can't reach Pakistan even if they clean sweep the T20I series against Australia. Because Pakistan is currently sitting firmly at the top with 138 points.
Winning the series 3-0 against Australia doesn't take India to the top spot but it will definitely help them to solidify their position at second place. The rating improves from 123 to 129.
In that case, Australia having lost all the 3 matches, would slip down to 4th place with new rating points at 114. England who have 118 points eventually take the third spot.
Scenario 3:

To think practically, a clash between India and Australia won't be that one-sided, especially when it is in Australia itself. So there may arise a scenario where the third match turns out to be the decider. And one good team fights it out to take the series eventually. This is also a likely scenario in a 3 match series.
If Australia manages to win the series against India by a 2-1 margin, then there wouldn't be a major shuffle in the ranking. The teams stay where they are but both with increased Rating points. Australia will end up on 121, towards a safer zone from England. India will gain 2 rating points and remain at second place.
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