Here is exactly what will occur IF "guest worker" programs are put into place and practice. Many to most "guest workers" will plea reason to remain in the country -- children, sick parent/s, car broke down, political persucution, bought a house so can't leave, in debt so can't leave, emotional duress, racism, need an operation, lost my I.D. and on and on -- after their "guest worker" status is set to expire, with many attorneys ready and at the wait to sue the U.S. and individual states for a variety of reasons to force the continued presence in the country of the "guest worker" at issue.
These are the facts and familiar behaviors over time of nearly all who arrive in the U.S. illegally, and that is that they impose upon the country and insist the country accommodate them.
This story represents most of the realities in real time and real lives as to why I won't support "guest worker" programs -- because I know human nature and I know that "guest worker" programs are gateway programs that will encourage even more illegal immigration and illegal aliens afterward.
About these people, this story, they need to go home. They can go home and apply for immigration and citizenship afterward and then return the legal way after completing that process, just like every other million-upon-millions of legal immigrants.
The U.S. has to start being firm in enforcing citizenship and immigration laws, despite the hardships involved. The sanctity and significance and worth of citizenship is involved here.
Interestingly, Newt G. was on Rush a few months ago, outlining just what you've described: how to deal with multi-millions of illegals already here, etc..