It does raise an interesting question of whether a similar time-pressure might also be responsible for things like parts of the Mirror Universe coming in sync, since the alternative is that it is either a massive coincidence, or a someone else meddling.
Personally, I'm ambivalent about it. It has some interesting implications, with fate and whatnot, but at the same time, it wasn't really necessary, and seems like it would introduce a whole load of problems.
If events automatically converge, why was there ever a time war?
It also raises the Doctor Who type question of what happens if someone with knowledge of the future makes it impossible for those events to occur at all? Does the universe resort to increasingly supernatural means to achieve the same end, or break entirely?