pittpete... welcome...
Your decision depends on many factors. What's missing from the discussion above is what your discs look like. If they don't look too bad and you are experiencing improvement, it behooves you to wait and see. However, if you have a configuration that will surely fail.... sometimes sooner is better than later, because you preserve the health of the surrounding structures... facets, ligaments, etc. Leaving them for extended periods in a severely collapsed config may eliminate options that you have today.
Discover your options, make informed decisions.
Good luck!
Mark
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