There is substantial untapped and underutilized potential already within the country. Using tax money to support immigration of those that possess neither skills nor funds, is frankly a slap in the face to all tax payers, and a signal to Americans that we are giving up on them.
But of course one powerful group needs cheap labor, and the other powerful group needs more voters. Thus, with collaboration of the media apparatus, what you suggest will continue to be branded as sensible.