The notion that an employer should be able to legally employ a person who is in the country illegally is simply loony.
By your rationale we should also repeal all child labor laws and put 7 yr olds back to work in the coal mines. Or, is that somehow "different"? The 7 yr old in the coal mine is actually more defensible if they're a citizen.
Well, if it's a good thing that legislators be encumbered you may need a new legislative system. I mean, it's not like the Constitution was delivered to Moses on top of a mountain or whispered by Allah into James Madison's ear. How many times has it been modified and re-modified and how much turmoil does the process cause? I guess we'll find out with this 'anchor baby' issue.
17 times in 250 years (after the initial bill of rights). Proof that it was written pretty well. Encumberence is even written in the Declaration of Independance.
Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes