I definitely agree that a 6 person party makes much more sense. Though, if they do take this route, then I hope they consider adding a few more potential party members to choose from in Acts 1 & early Act 2. After all, I do still like being faced with difficult choices.
I've heard that they're planning on having a total of 12 or 13 companions or so. Not sure about the exact number, but htey will most definitely add more.