If that is true, then old miners, even if they are a minority, should reject the blocks created by the new miners, as soon as they start including the redefined opcode. Isn't that correct?
It was explained to you that the op code is *valid* in the context of validating a block (so of course the block would not be rejected by older software). Why do you think it is called a NOP?
If you still cannot grasp such a very basic concept as how this stuff is working then I suggest you simply stop with your "analysis" of Bitcoin because you will never get it.
(and btw - much of software deals with many practical things such as byte size limits that don't apply to math in general so you're not really making any sense with that statement either - if we were talking about pure maths then the block reward would never end for a start)