Once you start taking spots from CONCACAF, then the Europeans will want to do the same with Asia, then Africa, et cetera. Rinse and repeat. Give a mouse a cookie and he'll want a glass of milk.
And to be honest, it's only the good sides pulling Europe along. Look at how Greece, Slovenia, France, Serbia, Denmark, and the Swiss all crashed out of their groups this year while Asians, South Americans and North Americans went on instead.
So no, I refuse to give up a CONCACAF spot now that I think of it. We deserve three spots and one playoff with SA. Nobody wants to see Greece or some of those other sides at World Cups, so fuck em. Put and qualify or shutup.