"Incremental steps"? You mean toward the destruction of our society? A "temporary guest-worker" program would likely end with millions more U.S.-Mexican dual citizens and would almost certainly NOT be accompanied by more border security.
It's not that hard to arrest and deport illegals with outstanding warrants against them. Nor would it be it difficult to begin crackdowns on employers of illegal aliens and to crack down on social services for said illeals. That would go a long way toward helping the illegals deport themselves.
As for our border, undo the military cuts made in the early 90's and line up National Guard troops next to Mexico. It'll work like a charm--and save lives.
As far as Tancredo's idea of a moratorium on legal immigration, he needs to spend a little time paying closer attention to the decreasing employee-retiree ratio in the U.S., and how the accelerating pace of baby boomers retiring impacts our economy.
Maybe if people in the 80's and 90's had spent a little more money saving for retirement and a little less on German automobiles, that wouldn't be a problem.
But speaking of the elderly, I for one am not excited about explaining to my grandchildren the shoddy state of Amexica fifty years from now.
Also, even if you got rid of all the illegals (and, one hopes, neo-Aztlan nationalists as well) and put a moritorium on immigration, you could keep the birth rate at replacement levels--easily--by banning abortion.
As I said...