I would argue that the prohibition of vices is ineffective. There are plenty of drugs without upside including alcohol. No history of prohibition was ever anything but a giant waste of money that created organized crime. Gambling is so simple that you'd get casinos popping up everywhere. There's also a secret, sinister third one about sex.

Would society be better off without it? Sure. Would the prevalence increase with legality? Sure (maybe because I think it was just for senators or something?). Would I be torn up if Missouri decided it was a dumb idea? No. My point? It would be funny if it happened - doubly so if it was just for congresspeople.