This is the most likely. If I remember correctly, the contract with Activision states that the first Destiny and the first Comet releases have to be on 360 and PS3. After that they only have to be supported, but new Destiny and Comet releases are next gen only. Hopefully this is the case, as I agree that some of the reasons this game seems lacking is having to placate to older tech and have the same experience across both generations.