A small thought. When AI gets good-ish then would it work sort of like this:

You go to a supermarket and ask it where the beans are, it tells you. It reminds you to pick up toothpaste. You go to the checkout, but to the AI enabled one because the AI is nice and chatty and asks how your day was.

You pop into mcdonalds and the AI greets you, asks you what you'd like to eat (I imagine it will be on a screen as you walk in)... questions - am I talking to mcdonalds AI, or will my personal AI follow me into the store? How will my personal AI interact with mcdonalds - via APIs or something?

Or will each store have its own AI, so if I pop to Tesco then Tesco AI will talk to me.

I find it weird that on android I have one AI, on my desktop I have Cortana and Google/Chrome, on my iPad it's Siri... I don't want to be interacting with a thousand as I show and game and browse the internet. I want one that follows me around.