I don't think Zelda would be so bad of a game if it incorporated guns into the formula. I mean, all Zelda games can form a fanbase even if they are different (Adventure of Link, Majora's Mask, Spirit Tracks), so I don't see why a modern Zelda would be any different. I'm not advocating guns in a Zelda game, but it wouldn't be too crazy to work out!
I don't think Link himself ever should carry a gun. It's not Link. However, I think it might be able to work for a mini-boss or something. Something that you could maybe deflect the bullets with your sword. Maybe something like an old western cowboy in the desert could be interesting. I was half expecting to face an old west cowboy in the Hidden Village. So yeah, I think it could work for a mini boss or something.