They're already bundling an x-box controller with the rift, and if you're playing flight sims, you're going to want a HOTAS. I think the idea for this is that it can feel natural enough that you almost forget you're in VR, and actually pick things up and use them in a semi-natural way.
Which is great, honestly! I'm really excited to see how that rolls out! I guess the best way to sum up my concerns is I'm afraid with their current design, the controller's going to fall on the wayside as a "gimmick", rather than a peripheral people want to include in their game, or implement if their game already exists (quite unlike the Rift, which devs seem excited to provide support for).
Based on people's reactions who've experienced this kind of thing, and the similarity with the SteamVR controllers, I think they are done right for a "natural" VR experience controller. For example, the Playstation Move controller just has 5 buttons and a trigger (compared to 2 buttons, 2 triggers, an analog stick and some sort of finger tracking for the Oculus Touch), and everyone who tried the Morpheus demos seems to think they were amazing. The main problem is that it looks like they aren't going to be shipped with the Oculus, so developers might not feel they can rely on people having them. Also, the games that work best with them might well not work at all with a gamepad.