With three years of their lives, plus 3 years of some refundable taxes invested, *MOST* of the illegals will return home on their own accord rather than forfeit and lose all of that investment.
That's the beauty of Bush's plan. First they Register so that we finally know who and where they are (as well as learn their employers), then they pay a fine for being here illegally (or they can go back to their home country and avoid the fine), then they have to stay out of felonious trouble and hold a paying job and pay taxes for three straight years, and then they have to go back to their home countries before they can proceed with getting legal permission to stay/work here any longer (as well as to get their taxes refunded).
And world opinion can't touch us. Unlike what would happen if news crews filmed the logistics of deporting 8 million illegals at once, no one can cry about illegals going home on their own volition to re-apply for U.S. re-entry from their home country.