Then why won't Tancredo agree to do border security and guest workers and/or immigration quota increases together? Pro-growth conservatives (at least this one) might not trust isolationists/unionists/protectionists to not pull the reverse bait-and-switch: secure the borders but then refuse to do anything about providing for our labor needs.
Its only logical. Before there can be any legitimate guest worker program implemented, the borders must be secured. Otherwise its like putting the proverbial cart before the proverbial horse. No system is perfect and getting a handle on the problems of illegal immigration and open borders will assure pitfalls. Some businesses might have to suffer while the process makes progress.
You have nothing to worry about there. Absent in all the border security debate is the fact that the State Dept issues hundreds of thousands of tourist visas to Mexicans every year, knowing full well that they will be misused by the recipient who ends up living and working in the US. Many illegals have this document, and there's no talk of the government restricting access to it in the future - quite to the contrary.