I don't know your plans for the future Bungie, but if you plan to keep using the Unstoppable, Antibarrier, and Overload mechanics, I would update all previous exotics to have one of these. It'll make it so they're more viable in each situation.
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The whole overload unstoppable barrier mechanic is just bad. I can't use fusion rifles and other weapons I enjoy in the activities I enjoy because I have to have a weapon that has at least two of these three things on them. I have weapons i love and have fun using including the exotics that you're referring too that just sit in my vault and collect dust. This game gets boring as -blam!- when I'm running the exact same load outs all the time.