The last barbarian has currently several HOURS of content to offer. And it's still growing and is beeing updated even tho the dev had problems. And the dev is constantly updating the game and adding new things without ruining the game itself as other developers do. But also the updates are actual updates and add stuff. Compared to other unity games this game and the dev are already providing us with more than any other. Just look at the development of most, if not all other unity games on here. Most of them are abondened at a stage where you can't even see a single sexscene or the world looks like it's made with MS paint.
My personal opinion is that we can only wait and see what the dev comes up with and realy, at this stage it doesn't even need to be 'completed'.
But if you're just talking about the storylines, yeah those should be completed.