My thought about a new camera.
Bear in mind I really like some of the new cameras but my camera is working and I have learned it's quirks to take good enough shots for my needs. Yes I'd like some camera with I.S. but mine has a viewfinder (old school image stabilization) and again it works.
While I would be a little upset to lose that old camera, a new one would be more upsetting.
Plenty of reasons to stick with what you have and my last reason. I know about how many shots I get on a charge. I can plan my trip so I don't need a charge or maybe one given my old camera. With a new camera I have to error on the short side of shots, plan ahead for more batteries, etc.