It says point blank in the EULA they can change stuff however they see fit. You agreed to that.
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Doesn't change the matter that it's shady as hell.
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It's pretty standard "incentivize a purchase" practice actually. Like it or not. Would Destiny be better of more people played? Yes. Should Bungie give non TTK owners more incentive to keep playing? Yes. But nobody is being "robbed" and what they did is completely within the EULA everyone agreed to by playing.
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Yes, legally, they are within every right to. I know that. Morally? It's a bit wrong. But that's not big business anymore. Money over morals. It's a bit sad, actually.