It would give the gunsmith some business, and give us something worthwhile to use our Motes for.
Also would give me a reason to have more than one type of the same gun. I usually just dismantle ones with worse stats to save on space. It would be fun having an Ice Breaker of each element.
Edit: Legendary weapons only....ignore my greedy Ice Breaker comment.
Edit 2: Maybe make it just one reforge session per weapon..once you leave the vendor after reforging, that gun can't be reforged again.
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I'd imagine they have some sort of plan for this. Right now we are just collecting and learning how the different weapons work. Adding reforging across the board would be confusing to some. I think it's a good test to see how it turns out in-game by doing only IB weapons first.