Not only should Ohlen, Sky, and Karpshyn not be angry about MOoT, they are probably thanking their lucky stars that WotC is putting this book out. What better way to get more people to look and/or purchase Dragonlords than for an official D&D setting emphasizing and being set exactly where their book and adventure is? The Ancient Greekish setting of Theros will catch the eye of many more of the less "tuned in" players of D&D-- the ones who don't know about all the 3rd party stuff available-- and they'll pick the book up since its an official D&D setting. And if they find they like what they read, that'll inspire them to go looking around for more Ancient Greek stuff-- allowing them to find Dragonlords and the others. And those books will probably get more eyes on them that way that they have gotten already.What's really interesting to me with Odyssey of the Dragonlords (which is excellent - better than most first-party products I'd argue) is that WotC just hired the all three of the people behind it - James Ohlen, Drew Karpyshyn and Jesse Sky, into being in charge of their new Archetype Entertainment studio. So they're not exactly going to be mad with WotC!
They didn't exactly ignore it, I guess...
Confident Odyssey of Theros will be roundly inferior to it, but I have to admit, unlike the previous Magic book, I might well get Odyssey of Theros. I am a sucker for that kind of setting. Plus it sounds like it can be stolen from a lot, potentially, for other settings.
It could very well be a coincidence... but I think the fact that there isn't an adventure within the Theros book will only help direct people to the Dragonlords campaign adventure path. And it could be WotC's way of throwing Ohlen and the others a bone for coming to work for them.