I've never understood the mentality that you can only buy one game or that you can only like one sort of game and hate everything else. Certainly I can understand not having the money to afford more than one game at a time, it's generally how I've gone through much of my gaming life. But the idea that it's some sort of unwritten rule that people only like one RPG or one genre of games and nobody buying DA:I will be buying anything other than it or another RPG? Don't get it.
I like several different RPG series, and different styles of RPG. Maybe I'm really strange and a minority in that regard, but I enjoy party-based RPGs and open world RPGs and I've enjoyed some JRPGs as much as WRPGs. Of course I like some more than others and have preferences, but it's not an either or situation for me. I'm capable of enjoying lots of different things when money and time allows.
Since I've pre-ordered the Inquisitor's edition I'm not going to be buying anything else at the time. Doesn't mean I wouldn't if I had the money to.
Personally I'm looking forward to Arkham Knight, but since I'll be getting it on PC (and had problems with Arkham City on PC when I pre-ordered it), I'll be waiting for some time for patches before buying, perhaps even waiting to see if there'll be some sort of GOTY version with the DLC bundled together. I'm also interested in Alien: Isolation, particularly since my favourite author (Dan Abnett) is writing for it, although I'll once again be waiting due to needing to save money and I'm not particularly good at the run and hide style of horror games. And I'm planning on picking up Shadow of Mordor because it looks fun and the stuff they've got going on with the hierarchy of the orcs looks interesting. I love LOTR, read the books about nine times now, but I've never held them as sacrosanct. I'm sure I've read that Tolkien wanted other people to add to Middle-Earth, but a lot of fans seem to think it's blasphemy to even try. But I'll be waiting because I can't afford to buy it at launch alongside DA:I.
Are any of these games competition for DA:I? In the sense that not everyone can afford all the games they might want and will have to choose, I suppose so. But competing for customers money doesn't mean the games have to be the same sort of games, the same genre, or even similar games. They're a product among lots of other products. Films, comics and books compete for my money alongside games, because they're all forms of entertainment I'm interested in. It doesn't mean they have to be comparable in any way.
And now I'll stop rambling and go eat dinner. 