cutting a line, perhaps not, but think about what happens when there's a line at a supermarket counter and suddenly the counter closes and a new one opens up.
In Japan, when it happens, the new clerk usually goes in person fetch a few first-in-line people from other lines to make the new one. That goes along the parent's point of "you don't have to think about it, someone will do the fair thing for you".
that was what i expected from the rest of this discussion, but it's nice to have it confirmed. in the us, whoever was lucky enough to notice where the new line was going to open first would rush there and be the new first person in line.