 I would wait until there is some sort of concrete number available that either confirms or differs from the estimate, until then we could make it clearer these are pre-event estimates. But I doubt whether we will ever get a clear answer since the diversity of media makes it extremely difficult to know who watched it. I haven't actually seen anything to backup your assertion that it wasn't watched by 2 billion people. Remember that although the UK has a small population and despite the hype in the US it may not have been watched by many - but they only make up a tiny portion of the nations that would have been interested. In particuar it will have been extremely popular in commonwealth nations like India which has an enormous population, events like this are also extremely popular in European countries especially Germany, France, Austria, Hungary and Denmark.     