I feel like BioWare are between a rock and a hard place here.
If the release story DLC some fans will be like 'fix your game before you milk me of money' but if they don't at least announce it soon many fans who are waiting on it will wander off once the next big RPG comes out.
I'm going on the sales and the general reviews, but also the high number of hardcore fans on these very boards who are thrilled with DA:I and will defend the things I see as flaws to the death (dead empty world, watered down plot, overabundance of fetch quests with no side quests of substance, very limited characterization and roleplaying opportunities, etc...).
Fun fact: I'm a console player.
Each gamer is different, what some see as flaws others see as good game design. I feel that most of the areas were populated enough because they were supposed to be the wilderness, seeing lots of NPCs running around a desert or dense forest would be weird. The only place I felt was underpopulated was Val Royeaux, I was expected it to be at least the same size as Kirkwall with more hustle and bustle.
The plot wasn't watered down, it was as epic as DA:O's but because you could spend hours dicking about between major plot points, it lost its epic feel
Quite frankly that is my biggest issue with DA:I, the plot and the exploration seemed to be conspiring against each other . Most games that feature lots of exploration have a shoe string plot and most story based games don't have a lot of exploration because they want to keep you focused on the story.
BioWare tried to balance the two and IMO didn't get it quite right.
Still though I think it is great game, with some of the most enjoyable companion quests and interaction I've experienced.
I've already played this 8 times through and once W3 is released it will definitely get shelved dlc or not.
I've got 2 complete playthroughs at the moment and was planning on holding off at 3rd until the DLC comes out (as is my tradition with BioWare games), I do this so I don't get burnt out on a game too quickly, but without even a release date for the story DLC then I might start up a third sooner than I thought, since there are still a lot of decisions I'd like to try.
The Witcher 3 coming out won't affect whether or not I play DA:I DLC though, as interesting as it looks, I didn't like the previous 2 Witcher games so I can't imagine I'll like this one.
Might check it out once it get cheap though, I'm not sure.