Decide whether to hide or destroy views

// TODO: This destroys the old view, and renders a new view, in the #content div.
                // But if the view has already been rendered, and has some state, it might
                // be better to HIDE other views, and DISPLAY this one, rather than render it,
                // because this would preserve the rendered view's state.
                // Con: Preserving the rendered view's state is not what most users expect.
                // Pro: It might be what most users want
                // So, do we want to preserve this view's state?