Well, I'm just having such a difficult time deciding. If I decide to stay with a point and shoot, is it the consensus that the Sony Rx100 is the best option? I see the RX100-ii is 599 and RX100-iii is 799. I think 799 is a bit more than I'd want to spend, but for 599, it's an option. I have to say the biggest complaint I have with my little Panasonic DMC-TZ3 is low light photos. If I can solve that problem without going the DSLR route, that would probably be my first choice. But my current camera has a 10X optical zoom. The RX100 says it's just 3.6.
A typical dSLR lens is about 3x.... Larger sensors have less zoom. Take a professional wedding photographer, they typically have a "3x" zoom lens on their camera when they are shooting. (or a 1x in many cases).
I know it's confusing.... But this "x factor" is irrelevant, but it's a question of mm equivalence. A 200-400mm lens is only "2x" but it has a heck of a lot more telephoto reach than a 18-55, which is 3x. So in that example, the 2x lens gives you massively more magnification than the 3x lens.
The kit lens for the Nikon D3300 and D5500 is the equivalent to 27mm - 82mm.
The RX100ii is the equivalent of 28mm - 100mm.
THe RX100iii is the equivalent of 24mm-70mm.
Most knowledgeable photographers prefer the 24-70 over the 28-100 --- The aperture is faster, so it's better in low light. Plus, many like the nice wide angle options you get at 24mm, while being more willing to sacrifice the 70-100mm range.
The Canon gx7 uses the same sensor as the Sony RX100iii, and it has a lens range of 24-100mm.
If you are shooting wildlife and sports, then it can be critical to have a lens longer than 100mm. For most every day use, it's not too important.
Here is a good comparison of the GX7 and Sony RX100iii. They are very similar cameras. The Canon has a slightly longer lens. The Sony has a viewfinder and a longer battery life.
http://www.gizmag.com/canon-g7x-vs-sony-rx100iii/33898/
You absolutely do not NEED to go dSLR just to improve in low light. Mirrorless cameras and enthusiast P&S cameras are just as good in low light as dSLRs. dSLRs are for people who want bulky cameras. (And yes, some of us want a bulky camera with easy to reach buttons, etc).