User blog comment:Saratje/PC release date explained - Skyrim: Dragonborn DLC/@comment-84.25.104.150-20130117124139/@comment-82.235.64.187-20130120170802

Considering TES online will take place in all of Tamriel, it's likely there won't be any TES VI at all. So yes, TES online will pretty much ruin everything.