Board Thread:Theories and Speculation/@comment-26152226-20150227163755/@comment-3279282-20150227202644

The curse is based on Hagoromo's decision to make Ashura his successor. Indora got butthurt over that and this butthurtness continued to live on till the present day, through his incarnations. Sasuke, as Indoras most recent incarnation, realized that he was wrong, thus ending the curse. It's really that easy.