That's just hazing bullshit, "I went through this misery so you must, too!". You fix it by making the legal route less awful, not by intentionally inflicting even more suffering.
The minute you announce some kind of concession for people already here (which would most definitely be part of a broader immigration reform bill) then the floodgates will open with people trying to make it in before the effective date.
[1] https://www.cbp.gov/newsroom/stats/southwest-land-border-enc...
Either way, I can’t see any progress on immigration reform. It’s not happening, unless the flow at the border stops or reduces significantly.
The idea that immigrants are a net cost in terms of social services is nonsense.