I think the PM has proved that he is not in charge of the situation going around and thereby has proved that he is running a lameduck Government with no decision making power
Moreover as they say old habits die hard, The Congressman once they occupy any chair just dont like to leave it and thus. I am sure whatever happens, the PM will not dare to submit his resignation, which he should immediately do, to at least regain and maintain his image and also prove to the world that he can sacrifice to maintain his self respect