The lesson
Open a keynote with the buyer's world, a crowd on a street, before saying anything about your product.
The opening slide is a full-bleed photograph of people walking on a sunlit city street. Two lines read "Welcome to the era of Subscriptions", each set in white on a hot-pink highlight block at the lower left. The product is not named on it.
Only claim an era if you can name the change your buyers already feel. Keep the photo-plus-one-phrase slide format, and don't write the era slogan unless the next slides support it.