Yes, dump the camera/system you shoot least. Be it as it may, the internet photo forums are gear-hungry. It is all about gear. And that's okay if you're a collector, but you are a photographer, or desire to be a photographer then trickle in the equipment. Learn one camera/system and even lens before diluting the learning process with new equipment. We all want to shoot like a pro. What makes a pro different than a non-pro? A pro is consistent and the pro gets the defining, decisive and exceptional image, day-in and day-out. How does acquire the pro's atributes? With skills developed through experience, shooting everyday, shoot all sorts of genres in all manner of environments with, (here's the rub), the same equipment. Shooting with that equipment until it becomes an extension on your own eyes and hands. So shoot, shoot again and when you think you're done ... shoot some more. Granted, shooting with the same ol' stuff can get tedious, ain't as much full as equipment. This methodology is the quickest path to attaining pro skills. One's camera handling skills increase and the camera setting will become nearly automatic. One's vision becomes clearer because you have less cameras setting to think about (they've become an automated/semi-conscience thing) and you become more creative because you have limited equipment, (at least until you've grown into the new equipment).
There are always exceptions and there are genres which require more equipment than a semi-wide to normal FOV.
Gary