The main reason why you carry this camera is because of its size and above average PQ compare to other high end compacts such as LX7. If you need to carry another camera such as DSLR along with RX100 at the same time, don't you feel it defeats the whole point of having RX100? Well, I mean yes, If I feel the need to use higher end gears in some conditions, yes, I will carry heavier gears with me. However the truth is 40% of the occasions, i only need to carry Rx100 with me without anything else so I can enjoy most of my time with my family and taking casual pictures with RX100. Again, maybe it is only me, but I'd rather use EVF instead of boosting LCD brightness to max (and still can barely see anything through LCD) which will drain battery quicker than you expect... coz I like to take pictures with good light outdoor.
By the way, I do think RX100 is an overpriced camera (ridiculously!!!) simply because it has no competitors, even at this promotional price at 809.99. One of my setup is E-M5 with 20mm f1.7 but it is still heavier and inferior in some part than RX100MK3 (thinking indoor video...). I obviously do not mean PQ here, but the need to carry more than one lens, and change them when you need to chase after kids.