I don't think anything is inevitable 100%, all cases are different. Most spend years fluctuating with hashi;s and the surgeon I used said that really when your thyroid actually "dies" out you are advanced in age. I sputters and dies and sputters and dies for years and years and sometimes go into remission for time.
He also told me that just with a diagnosis of hashi's they don't take them out, only if you have totaly lymphocyte infiltration and complex nodules that can't be identified.
Thanks for your response Karen,
It it most likely dies out when in advanced age, isn't it more difficult for recovery? I am guessing when it dies out, the hypo symptoms return even when medicated. Ugh, I don't to think about it.