Lament for pants

This pair of pants is so old, I don't even know when I bought it. I think it must have been maybe five years ago. It's a polyester pair of pants from Miss Etam I loved to wear, with a slight bootcut falling gracefully just past the ankle.

As years passed I gained weight and the pants stretched. The inner-thigh seam frayed under the strain, escaping the serger's stitches, but an emergency repair prevented the fabric escaping even more.
Later, I finally lost some weight and my lovely pants started to sag. The hem, always gracefully skimming my foot started to meet the floor. Ugly pleats appeared from the thighs, where they were now roomy, that fell vertically indicating they were now too big. Worse, the belt loops were so sporadic, that my belt sometimes escaped the pants and held them up in very minor points.

But still they were my favorite pants.
Yesterday the zipper teeth came loose from the zipper fabric, leaving me stranded in my favorite pair of pants. I pulled the zipper off so I could get out of my pants.

And now I face a very difficult decision. Do I repair the pants? Do I cut it at the seams and sew it anew, slightly smaller, after taking the pattern? Or do I give up and throw them out?
I can't face this decision in the cold morning light, and am content to put it off. Please help.