People raising their voices against Dhoni

Once the dust settles after this England series loss. Do you think the selectors will persist with Mahendra Singh Dhoni as Test captain
Sunil Gavaskar has said it's time for Virat Kohli to take over as India captain. Do you agree ?
The next Test series is against Australia in February/March. How does Sachin get his form back for this crucial encounter ?

How important is the Pakistan series for Sachin now ? He does not always make himself available for ODIs but he will surely play against the arch rivals ?