No idea.
It depends entirely how they go about the whole elemental system gain.
Like making them used for more than just shields or to be used during an elemental burn modifier, and adding more elements.
Who knows, maybe they'll make it in D2 so that elemental damage is even rarer, like specific to Fusion Rifles (kind of like guns at the start of Destiny 1)
Maybe they'll make it so all guns have elements.
Maybe it'll just be exotics.
Who knows.
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I'd settle for just exotics, as long as all the burns get a gun to go with.