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Thanks for putting up your question on Just Answer.
Since Dr. Bornfeld isnt online at the moment, and I see you have been waiting for a while, I will answer your question if that is ok with you.
No, this procedure isnt really necessary if you have no symptoms. The dark shadow at the apex of the root of your tooth is a periapical abscess or a rarefaction. Your root canal is an incredible 40 years old ! There is bound to be some periapical lesion after so long, this is nothing alarming.
Your Endodontist was right, a re- rc cannot be done in the conventional manner for a tooth that has been filled with a silver point, as it is very difficult to take the silver point out.
But I do not think you require an apicoectomy at the moment.
Hope this answers your question. Feel free to contact me again for more information. Please leave a positive rating for me if this answer has helped you. I do not get credit for it otherwise.
Good Luck !