"Dead ends" is just a nice way to say "lazy writer." Every status quo "limits" choices. Period. Even your "perfect situation" creates limits that bind all writers to its premise. Conversely, all stats quos open doors for different kinds of stories that can be told. It's just about what kind of stories the Powers That Be want or what kind the reader wants to consume. Frankly, I'd rather the writers invest in one relationship arch and develop it rather than just cycling through filler flings, but, hey, that's the kind of story I want to buy. Fair enough if you think otherwise, but let's table the "dead end" myth.