The Modding community MUST BE BIG for this game to succeed.
LARIAN must be willing to assist MODDERS do what they can do.
I think they already are. I mean you can get mods right now, and there was just a news release (you would have to google it, it was some interview) about them continuing to support modders and offering a creation engine to make you own adventures and content. In todays environment with PC games, I think a developer would be crazy not to. Modding literally keeps games alive and popular. I generally get bored with games without mods pretty quickly.