I agree completely with what is said here.
It is a shame that Bioware puts all this effort into making there story arc involve the companions, which I think is a big reason for me enjoying the game, but then once you max out affection and the story arcs there is very little if anything that they do to keep that feeling Bioware has created.
All the suggestions above would help enhance that feeling and help try and maintain the appeal of the companions and I believe some of them could be implementated rather easily.
The unfortunately thing is since this is a new release, these companion tweaks are just cosmetic and don't hurt gameplay like some other suggestions do, so those other suggestions will have priority.
By the time Bioware gets around to these tweaks my companions will be a distant memory..."what you mean I'm married to her? Oh, I forgot it's been so long since she said anything about it to me..."
Let's hope I'm wrong.