The original plan was for Destiny to be an Xbone exclusive. That being said, each console has games (whether individual or series) that are exclusive to that console. That isn't a new thing. The main issue is when you are charging everyone the same price for a product but giving select users the full usage of said product. If you & I bought the same car for the same price, how would you feel if I got power windows included but you had to wait a whole year for the feature to be accessible to you? The buttons are there but you are incapable of using it for a whole year. While Xbox users in general have gotten lucky with some content coming out prior to Playstation people getting to touch it, it was only for a month-never a year.
A better option would be to say we're going to charge the PS users $20 for the full DLC, & the Xbox users pay $15 for the 90% of content they're getting & once the exclusivity agreement has expired, they can pay the remaining $5 to unlock the remainder of the content.
EDIT- Source links:
http://www.geek.com/games/bungies-destiny-was-originally-going-to-be-a-microsoft-exclusive-1604640/
http://articles.latimes.com/print/2012/may/21/entertainment/la-et-ct-bungie-activision-contract-20120521
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Good idea but I'm not sure one the whole being a Xbox exclusive. Still good points