Because our "means" are vast and quite sufficient to accommodate a far larger population, there will certainly NOT be any deliberate reduction in LEGAL immigration. We are looking at staving off a population contraction in the mid to long term. There is no "population explosion" to worry about. Exactly the contrary is the challenge facing our nation in the not-so-distant future. Fortunately we have the room, the resources, and the strength of culture to manage these inevitable demographic changes if we acknowledge reality and plan prudently.
More specifically the number of working Americans has gone down significantly and this trend may continue as the baby boomers retire, this assuming they can retire.