I think the best solution would be to have it removed/hidden by default, and user selectable if so desired by the individual user, perhaps make it so that the default is controlled by admin setting.
It is also nice to have the switcher available, when debugging themes, since mobile view on desktop sometimes gets caught/frozen.. when I cannot remember the querystring to manually set the desired view mode, I use the developer tools to change the view class of the HTML root element.