Interactive Democracy is a slow process best suited to careful consideration of social change... but the world can move at a fast pace!
I think that the elected Government should be able to implement new policies without going through the long winded process of ID. This may be especially important in international diplomacy or solving any type of crisis. However, the electorate should wield the ultimate power in a true democracy and policies should be changed if the government loses a subsequent challenge won through the ID process.
I'd expect the Opposition in Parliament to continue in its role of questioning and challenging the government. Undoubtedly with a view to their own electability and future prospects as the new government.