It seems to me there's no point buying an RX100 now that the iPhone 7plus has a zoom. So I would humbly suggest that the ultimate combo is 7Plus + an RX10iii. To get all the focal lengths (28 to 600!) and to get water resistance. The RX10iii would be perfect if you could get GPS from the iPhone like the Olympus E-M1 can! Until then I'll stick with my E-M1 and it's 75-300mm i.e. 150-600mm zoom.
21st century cameras are social and on the internet and awesome-ized by software and sensors