Gates' prediction: "Software that knows when you've booked a trip and uses that information to suggest activities at the local destination. It suggests activities, discounts, offers, and cheaper prices for all the things that you want to take part in."

What we see now: Travel sites like Expedia and Kayak offer deals based on a user's past purchase data. Google and Facebook can offer promotional ads based on the user's location and interests. Airbnb, which lets people stay in homes rather than hotels, started to offer specialized trips at destinations so you can live like a local, too.