This is what happens when the pro-immigration side makes themselves look this bad, essentially dismissing Congress from the process and engaging in illegal mass legalizations. They only have themselves to blame.
A future President, either a Republican or a law-abiding Democrat, will likely propose a reasonable immigration reform bill that will tilt the numbers back in its favor relatively quickly.
This poll is about illegal immigration!!!! I don't think the public will ever support illegal immigration, and nor should they. If changes need to be made to accommodate certain industries to rationalize the immigration system, like agriculture or meat packing, then it should be done by legislation.