Definitely NO!
I didn't use that in BG and I imagine it as not really good.
Additionally it needs changes in the design, which we don't want.
I'm not a opponent of multiplayer-modes, on a contrary I like it, but in Wi-Sims (like patrician 4, anno 1404, airline tycoon evolution, online poker, settlers 2) and not in a singleplayer RPG.
I'm a great fan of LAN-mode, specially in times of "always-on" and "you have only the client at your desktop, maingame is in cloud", but there are things in live best be relished alone, like a good book, like a game, which is supposed to be like a god book.
Maybe the next obsidian project is another kind of game, then we can talk about multiplayer.