Of course, if everybody offsets by the same amount, there's no point in doing it! It just moves the problem a mile or two to the right.
That's missing the point entirely in my opinion - the NAT tracks offer 1nm and 2nm offset which, when you consider the centreline track as well, gives crews three options.
On average, you ought to have a situation where the traffic density is spread across three tracks, reducing the collision risk.
No-one's saying everyone has to offset. What's being offered is the chance to lessen risks by having two-thirds of crews follow something other than the centreline. Instead 90% of crews are still going straight down the middle.