Hi sheri. sorry to hear your disectomy doesnt sound like it was even a marginal success. There is no way of any of us knowing the answers to the "what if" questions you proposed. We are all different and our pain levels are just as unique to us also.
Keep in mind that You are the captain of the ship and only YOU decide what surgery is done and what is not done. You can hold off for ever if that is your preference. But you WILL KNOW when the time is right for any further type of surgery.
You will have to gauge on how well you are doing or not and also with keeping very good communication with your surgeon. Getting you well is a team effort between you and the surgeon. I can't stress that enough.
I wish I had a crystal ball and could tell you what will or wont be, but I don't own one. I do hope that you will improve that maybe the disectomy will buy you some more time before a fusion is needed if at all. Hang in there.