You could arrange your furniture such that you can cover the worn areas with Area Rugs. Be SURE the rugs either come w/a pre-sewn in vinyl backing, or you buy the stand-alone backing on which you'd lay the Area Rug(s). Use your arrangement and rugs to cover the worn areas.
You could also use Runners and Mats (with the same backing) too for smaller 'areas'. Now, beyond a true refinishing of the floor, there are some 'gimicks' that say you can refinish your floor with a bucket and a mop. DON'T be fooled. They're usually temporary AND aren't meant to 'replace' a true refinishing. They're more for restoring the finish; NOT refinish the floor. In YOUR case, the finish is down to the wood and then some. This is bad because IF and when you decide to refinish, a good bit of the wood surface may need to be sanded. And in some cases, it may not be sufficient or even possible to do the job 'right'. Soooo, either protect/cover the wood that's exposed or have the floor refinished. DO realize that you can more furniture into a separate room, then SEAL it off from the room(s) being worked on. That way, you dramatically reduce/eliminate the dust in the remaining rooms in the house.