Idf, you have to weigh out the pros and cons, and there's many on both sides, the choice is yours and no one can tell you what you should do, if you've read the many discussions here you should have a good grasp of what you're getting into.
Methadone is great for long term CP, but like I said, often backs do get better over time, your dilemma is to either try and wait it out on other pain meds and see if your condition improves, or face the fact that it probably won't and stay medicated for life. Be advised, spine surgery has like an 80% failure rate. I faced these same dilemmas myself and chose to wait it out, my condition improved and it was the right choice for me, my pain was in the same area, could hardly walk, took absurd amounts of OC, refused methadone, quit pain meds, and my back pain is 90% pain free today, and I'm drug free.