My basic point is that a guest worker program is one fashion of controlling the borders. You may like the idea or hate it, but it is a proposal for a law that controls the flow of workers from other countries to the US. That's 'border control'.
As for the numbers of immigrants. You're missing the point. It isn't aggregate numbers that matters here but the rate of immigration vs. our ability to assimilate. No nation in history has ever been able to absorb the staggering numbers (and percentages of it's 'native' population) of immigrants in the time frame we're looking at and still survive intact. It will utterly destroy the country. The rate of immigration to the US is high, but not much different from the rate between 1870 and 1910. The US was not destroyed by that in the least, but grew to the largest economy in the period. American history refutes your claim.
We'll quickly slide to third world status. Listen to me now hear me later. If implemented this is the beginning of the end of the greatest and most powerful nation in human history. Your hyperbole is laughable. Note that first - THE PEOPLE YOU CLAIM THREATEN US ARE ALREADY HERE ... So if this wave of migration is to destroy us, it already should have destroyed us. Hmmm, but it hasnt. Despite all the problems, the costs of it, etc, our country has survived. Perhaps you underestimate the resiliency of USA.