Anyone wrap their crib mattress to help prevent SIDS?

http://www.healthychild.com/toxic-sleep/has-the-cause-of-crib-death-sids-been-found/

I wonder why, if the solution is so simple, it's not done all over the world or in the US. If you're wrapping your mattress, is it then less important to buy an expensive one made with organic materials? By that I mean that in a selfish way, not in an important for the environment kind of way. seems like if it's getting all sealed up it wouldn't matter as much.

We're still TTC, so I've got plenty of time to research more, but I'm curious what your thoughts on mattress wrapping are