I'm not per se against just swapping the models and voices, but it will probably not rank high on Larian's priorities as romance is a small part of the game.
It sounds like a top idea for a mod, though. For the game, there is still so much to fix (mechanics (Like stealth), UI (camera issues, gameplay balance (classes/feats), general animation quality, quest paths (e.g. knocked out NPCs are treated as dead), dialogue choice (bugs and class specific writing), horrible bugs (my items disappear, pathfinding display error), even the enemy intelligence (poor strategy, placement and worse use of turns on select enemies)).
