Try telling that to a lawyer. Not enforcing your exclusive privileges does not extinguish your rights. People don't lose the right to vote if the government refuses to enforce election fraud.
You are wrong in the legal sense, and copyright is a very legal matter.
I think you are assuming that by "lose" I meant indefinitely, and for any and all future cases... but I explicitly defined what I meant, which was the cases where the rightsholder was made aware of an infringement, chose not to litigate, and then the statute expired, leading to a functional equivalence of losing the copyright in that one instance. I think a lawyer would appreciate the detail, and I don't think I am on trial for my own semantics here either, so I'm not sure what the actual disagreement is, besides that you don't like the way I used the word "lose".
Try telling that to a lawyer. Not enforcing your exclusive privileges does not extinguish your rights. People don't lose the right to vote if the government refuses to enforce election fraud.
You are wrong in the legal sense, and copyright is a very legal matter.