You know when a TV show clearly has plans for a few more seasons but the network gets nervous and cancels the show early. Then the writers have to cram 3 seasons of story into 1 or they do a wrap-up mini movie after the fact. That was our other option. We did a bunch of research to see what people will generally prefer. We don't have the time to complete the story by a launch window that we need. So, the options are rush the ending or launch with the campaign unfinished.
Also, I don't expect everyone to track all of our news, but just in case, this wasn't a general revelation from last stream. I and many others have said that the last 3 chapters would be coming post 1.0 for a long time now.
And it's not like it's going to take years to finish it. And it's not like the story is going to just stop when the main campaign is finished either.
So while this might be disappointing, it is by far the best option we have.
-Mike