You know when no one wants to help you for that one FP or that one HEROIC or even that one normal but high-lvl mission and you decide to try and solo it with 1 companion but keep getting killed and frustrated because you can't pass that annoying boss (not to mention that you've been queuing for a group for ages and don't find a group), well I propose this.
How about having more than 1 companion to help you out in combat, like 2 more to make a full group just like when you do with other players. Not only will they help you in combat, think of the affection ratings you get during a cut-scene, instead of 1 companion gaining (or losing) affections for the choices you make, 2 other companion will also be able to participate in the conversation and gain or lose affection to you depending of your choices (OK I'm not so sure people would love that, but it's just a suggestion).
Think of the possibility of having 3 companion at once following you and aiding you in combat, it would more..... Interesting, and no more waiting for days/week for a group for that one HEROIC or FP that everyone did already.
PS: it is just a suggestion, you don't have to agree with this.