I am sure atleast two of Ganguly, Tendulkar and Laxman will reject Sehwag. They might be friends off the field, but these three should have Indian cricket's best interests in mind. Also with Kumble in the official coach race again (by virtue of re-applying), it would be impossible for these three to pick Sehwag.
News is emanating that Kohli has not specifically said that he does not want to work with Kumble. Which tells that Kumble might likely be retained and even be given the contract till 2019 World Cup. Maybe Kumble might slightly change his style of communication, but I think Kumble will stay on.