The phone hasn't been announced:I will say that the 6S at least offered SOMETHING over the 6.3D Touch,Live Photos,an improved camera for the smaller variant,more RAM,slight water proofing etc
Now the only thing the iPhone 7 has is no antenna bands,headphone jack and a 3DT home button.If my iPhone 6 wasnt a laggy turtle I would have waited for the iPhone 8 which has OLED,glass body,edge display.
No one is gonna upgrade for so less features apart from Android switchers
1. you don't know the motivation of any consumer except yourself.
2. you don't know the features, because the phone hasn't been announced.
Here I trust apple more than the guessers.