Just wanted to register and add my voice to the throng, for what it's worth. Despite not caring for NWN at all for multiple reasons (poorly-conceived changes to the basic system, ugly graphics, poor single-player campaign), I was quite excited about NWN2 until I heard about this. Those recent gameplay videos are impressive.
But I simply will not pay for a 20-hour single-player campaign, I know many people not given to posting on internet fora who feel the same way, and I think it is disingenuous for JE to equivocate about the real length of what they will be offering.
It's simply responsible consumerism. I haven't purchased Oblivion because of some of their design decisions, and this is much the same. That's not to say that I won't ever play those games, but one of the few brightsides to the fact that publishers are so knee-jerk to declare games successes or failures is that even delaying a purchase a month or two can get your voice heard.
I hope Feargus was wrong, and that the main campaign is 35 or 40 hours. All things being equal, I'd be happy to give Obsidian my money. I s'pose we shall see.