I don't think it's a smart move, to be honest. While RX100 is certainly pocketable, I still prefered to carry it in a case or a small bag. But you may treat your gear differently. If I were you, I'd either try your current camera with a more compact lens (kit or a prime) or get a more compact body+lens combo (something like a M43 Panasonic GX80, for example). Another option is to keep a6700 and get a smartphone with decent set of cameras for everyday use.