Here's an idea Riot. If someome queue's as jungle, give them smite as preset.
And now you have 90% of Junglers not forgetting smite.
Edit: Or give the team a warning that nobody on the team has smite. It's not something that happens too often but it'd be nice to have for those few times the jungler forgets. (Whether it be to having that rare offrole game the game before, or just screwing it up somehow)