I do not believe the currencnt Indian team depends on Virat. If you can check the lineup they do have good players link Rohit Sharma, K L Rahul, Shikhar Dhawan and others to bat for. This team is evenly poised but it is not the same for Australia.
Outside India, especially when they are touring England, Australia, New Zealand, South Africa.etc, they are still overdependent on him. The players whom you have mentioned are world class, especially Rohit Sharma and Shikhar Dhawan. But they are not very consistent in green and bouncy surfaces. Only Virat has been preforming on a consistent basis, on bouncy and green pitches.
In test format, yup he helps tremendously but don't forget Rahane's match winning inning in South Africa and 3 tons of pujara in 4 games when India retained the border-gavaskar trophy by winning the series 2-1.
In shorter format especially t-20 India has fair amount of young batting talent. Kohli even used to take breaks during t-20 series so not much dependence on Kohli here.
If you are talking about ODI then again look at the performance of last 5 years. Majority of wins came because of Sikhar-Rohit-Virat, not just Kohli ( home + away)
PS: don't believe me.. check last 2 Championship trophy and World Cup numbers.