Well I'm sure it will detract and distract from other areas of writing at least, as it would be something someone on the team has to do and they'd want to (I assume you people will as well) do it properly with believable characters and development of the mushy stuff. Programming wise, I doubt it would distract that much to be honest, the engine's set up to handle dialogue and animations. My comment about the PM is towards knowing the exact degree of which, in terms of days, and what not. Same reason I'm sure you'll bring up if one the plebes here trucks out some outlandish feature they want.
Although I think you people will be happy in the end, Avellone's comment about relationships leads me to believe there'll be a couple of NPCs for you to get emotionally involved with but at least some better style of relationships as well.