There are MANY who have not seen the classic, and several old school fans who snub the new one, and many shades in-between. Plus, the very nature of a changing lead actor and supporting cast makes the canon like many separate series tied to a central framework of a man in a time machine with friends. Before New Who, the divisions between the fans was based on which Doctor or which set of Companions was best. It was always more fragmentary than not, from my perception, but unified too? Strange way to put it, but Whovians would close ranks against disparagers real fast, despite their internal debates over how the central themes were interpreted by this actor or that writer.