Ok, there are many possible reasons for why they have done this.
I understand that Fifa would like to protect teams against playing each other, I just think that if they finished 2nd that they are not really the "big boys" and that they don't deserve any protection. The real "big boys" can take care of themselves, so to speak ;). Anyway I have no problem about Fifa protecting teams with rules, since it has been happening for years, I just think that any rule changes which are made during one competition are ill advise, condescending and unfair.
Anyway, I'm supporting Rep. of Ireland and Bosnia in the WC playoffs and I hope they don't end up playing each other, but now I guess there is no chance of that. My point is that there should be, cause it's a competition to find the worlds best football team.