1. Will the tax receipts that the U.S. Government receives from these low paid immigrant 'guest workers' at least equal or be greater than the offset expense of hosting/caring for the current illegal alien resident and his/her huge family for years to come? The employer gets the best benefit while the tax payer gets stuck with the huge tax bills for taking care of these people so that Bush's campaign cronies get their el cheapo labor.
2. Our police agencies have a hard time just keeping up with criminal citizens and the I.C.E. can't even locate the more than 400,000+ (last number I recall seeing in print around here and growing daily) aliens that have been ordered deported 4 years ago so what makes one think we can keep track of another 10-20 million 'guest workers'?!
It's good to see that at least you're thinking about a solution.
Apparently I need to think harder. ;)