The Democrats and the professional ethnic grievance groups will never accept that. And John Roberts might not either.
Plus, the issue of anchor babies and birthright citizenship would still leave the legalized non-citizens able to produce millions of future Democrats.
But this idea might be worth considering if, and only if, the legalized non-citizens were not allowed to ever sponsor relatives for family-based immigration. That way at least the threads of chain migration wouldn’t be greatly expanded.
"Finally, legal permanent residents cannot obtain U.S. visas for immediate family members outside of established quotas."