Mixed feelings on this... I played through DOS with a friend co-op. It is a long story, and playing co-op (*when we had time to play together) made it even longer. I think it took us 3 months or so to make it through the game. We really enjoyed it, but towards the end it was just more-of-the-same (as we knew how to take advantage of certain spells to win encounters). It was great to play in an old-school RPG as Baldur's Gate (I and II) are right up there in my favorite games. Game length may be the reason I don't go after it... I just don't have time to play as much as I did when I was younger.
The two reasons I have mixed feelings on this... #1 is that one of the selling features of DOS is that it was mod-able - in other words, people could make their own adventures, or design their own components. I would have expected Larian to release some (edit: paid) follow-up adventures (either starting at level 1 or continuing the adventure on). While I bought DOS as a stand-alone game without the intention of playing additional mods, it seems like a bit of a waste to "abandon" it without using that potential.
The second thing is that Larian has made a good amount of money with DOS. How much? I don't know, but it was a game of the year, and won a ton of awards. Should Lairan (as a company) not be re-investing some of those profits into future projects rather than going back to a crowd-funding option to start a new project? That would be like EA saying "We need to raise $1M before we start to develop Madden 16". I fully support Kickstarter games for small studios, but for ones that have already had (and are still having) solid commercial success, it doesn't seem right.
All that said, Divinity: Original Sin was a great game, and is well worth the purchase, so I'm not down on that.
Edit #2... apparenlty Larian already anticipated the "why kickstarter again?" question and posted a media piece in advance of the kickstarter campaign:
http://www.lar.net/2015/08/12/returning-to-kickstarter/
Seems to me that an Early Access launch may have been more appropriate if they were looking for player-input... Only difference there is you need a playable game to launch in EA, while Kickstarter doesn't need anything off the bat.