Australia tour happened two years ago. Why you want to live in the past? Players like Kohli, Hard dick, Rahane, Siraj and Pujara are constantly underperforming ever since then. Since Kohli was the captain, he persisted with these people and never allowed any younger players to replace them. Only after he was dropped, promising youngsters like Venkatesh Iyer and Suryakumar could find a place in the playing XI. India is a country with 1.4 billion population and cricket is the favorite sport by a distance. If they can't perform well even in cricket, then a few questions will be asked.
Sounds weird argument considering WTC is 2 years affair.
Btw India has played 14 test match after BG Trophy and Won 7, lost 5 with 2 draw.
Why would you want to replace red ball specialists with the white ball players? If specialist players are performing bad then they should be replace with only red ball players, not the other way around. I don't remember Hardik playing any test match in last 3-4 so don't know what are you talking about by mentioning his name. BTW Siraj is young guy in test cricket, unless you only consider 19 yo as young.
This is average performance from them, and now it is good time to change this because with these changes and having new captain surely going to give some positive impact with Kohli is now out with is personal ego and personal likes and dislikes in team selection is also ended for many players.
With the entry of few youngsters and help of other senior players surely going to change all momentum against Sri Lanka in test matches after this they have very tight schedule which involved South Africa England and then twenty/20 world cup mean again no rest for this money making human machines. Look like now they are not going to have any fair chance in second WTC championship after losing first final against New Zealand at Lords, with some good number of white ball events waiting for them.