What if the protagonist is not an individual but the party. Each individual would have story goals based upon there backstory ideals, goals, and flaws. But it would be the party as a whole as the identity of the protagonist, much like Force Grey, or Aquistions Inc., or the C-Team.
It all depends on how much backstory will be written for the player character. When I think back on BG1 and 2 everyone but the Bhaalspawn was more memorable to me and I didn't find that a bad thing at all. The PC is simply an avatar of yours that exists in a fictional setting and from what I've seen in both WRPGs and JRPGs it's a perfectly viable strategy to put more emphasis on other characters i.e. party members.