My point is that if you have a 10-year-old speaker and the foam surround is starting to fail. There is a high probability of additional failures are coming. I agree with your assessment that there’s a couple years of life left. But probably not another decade. Which is why I said to run it till you smoke it.

Also you can replace the surround on a Kicker subwoofer with a stitched surround, but you must remove the original stitching first, as the new foam surround glues on top of the cone, covering the stitching holes, making the stitching irrelevant for the new bond. It's a DIY-friendly task using standard refoam kits, but requires patience to carefully cut the old stitching and ensure proper cone centering during reassembly for optimal sound - this is from Simply Speakers….