They could make Siri change its voice and Genmoji based on the degree of certainty of the response:
- Trust me: Arnold as Terminator 😎
- Eehhhh, could be bullshit: shrugging old man meme 🤷🏻♂️
- Just kiddin' here: whacky Jerry Lewis 🤪
They could sell different voice packages. Revive the ringtone market.