Quit conflating “legalization” with “citizenship.”
By law, you have to be a citizen to legally vote in a U.S. election. Legalized Hispanics will not be able to vote.
As for millions of Mexicans living and working in the U.S., they’re already doing exactly that! What we need to do is pass legislation that encourages them to do so legally, rather than illegally. Thousands of businesses and farms depend upon Hispanic laborers to function today, many of them here illegally (maybe most of them?) We need to transition to a system where they are here legally and we know that they’re here, and we know when they are required to return to their home country. Right now, none of that is done.
And, as I keep saying, before that can be even attempted we have to get control of our borders.
As for “most people” knowing what we’d get, try talking to someone who actually hires them sometime. Most of them are willing to work their butts off to make money. I remember a time when that used to be considered a virtue in this country.
But I suppose if you live in a state that will let an illegal alien apply for food stamps, get rent support, and probably even vote Democrat, your perception of them is different than mine. But that’s the fault of the legislators who allow it. You can create shiftless people if you throw enough free money their way. We’ve been doing it to Americans for decades. It works. They eventually become wards of the state unable to support themselves.
How do you plan to prevent these millions of Mexicans and their tens of millions of children from becoming citizens? This is not Saudi Arabia where the citizens are surrounded by servants from all over the world. The Saudi system won't work here.