I know if she can't get up and go outside for the bathroom it is game over but I also don't want her to be too uncomfortable either.
After the operation, and after a relatively short recovery period, my dog was just like her old self again. But, the vet insisted my dog only had six weeks to maybe a few months to live. She made it past the six week mark, and she seemed happy and healthy, but she started stumbling again so I had to take her to be euthanized. That was a terrible day.
I think the operation and medication cost about $2k. For me and my sons, the extra time with our dog was worth it because we were all still reeling from the divorce and I know my sons appreciated the extra time we had with our dog.