There will be a relatively limited number of persons taking advantage of this "temporary" relief from the risk of deporations. This ruling applies only to persons who are already here. It will not benefit, thus encourage, new illegal immigrants.
They must be under the age of 30, have at least 5 years of "documented" residence in the US, have NO criminal record, be in or graduated from high school or college, and /or be in / or have reached discharge from the military (served honorably) . This does not allow them to gaurantee their parents right to legal residencs, tho. It only gives them temporary freedom from being deported. This is not a huge group of persons, but it is the group that have the most to contribute to the US, and have the hope to become productive citizens . . Eventually.