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it will mean that everyone in the future had their dial set to the second position.
No it won't. Nothing you wrote into the story indicates that you can change the box (in case of no forecaster). If you could, that would change everything (and it wouldn't be the smoking lesion anymore).
I don't think you understood.
Consider Newcomb's problem by itself. Omega has already flown away. The million is either there, or it is not.
The only sense that you can change whether the million is there is this: if you decide to take two boxes, you are basically deciding to have been a person who would take two boxes, and therefore deciding that Omega would have not put the million. If you decide to take one box, you are basically deciding to have been a person who would take one box, and therefore deciding that Omega would have put the million there.
In my...