I think this rumor is absurd. If we're not able to use our old loadouts and weapons that have become essential to our arsenals, then we're forced to use these new weapons. The old exotics could never be replaced. I hope this isn't true, I feel that Destiny would lose quite a bit of players due to this.
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I can't imagine this will actually happen. Biggest reason is destiny released 3 exclusive exotics to PSN. Why would they give them to us in September if they won't be relevant?