Should I trade my m43 system for Sony RX-10

What you're talking about doing is trading the potential of a system for a fixed lens bridge camera.  Of course, the RX10 is arguably the best bridge camera out there with a fast constant aperture lens with a versatile zoom range.
So it's clear to me that the biggest question you must ask yourself is whether the flexibility of interchangeable lenses is outweighed by the convenience of a one-size-fits-all camera.  There is no one lens for m43 that will give you a constant F2.8 across that zoom range... and even if there were, it would be much more expensive and larger than the RX10.  On the other hand, for individual photographic opportunities, a fast prime will beat the RX10 significantly in image quality and subject isolation.  For concerts (and especially video), the RX10 is going to have a nice advantage.  I have a GH3 and I'd use my Panasonic 35-100 F2.8 for that (though obviously that ain't cheap).  For parties, street photography, portraits, and the like, there's definitely more potential in m43.
The RX10 would be a very nice camera to have, but for me a system camera is still much more versatile.  The nice thing about m43 is that you can just buy a new body when it's time to upgrade.  When you want to upgrade the RX10, you're basically buying an entirely new camera AND lens each time.  Buying lenses for m43 is an investment that compounds as you add more flexibility to your photography.  If I were you, I'd keep the Oly and save up for a nice lens for concerts.
Travis