Unlikely. This is a limited ruling. The Trump SCOTUS can easily refine it to limit any advantage to a future Democratic administration. Assuming there are any free elections in our future, where a non-MAGA candidate could win.

Not if they are white. Have you seen any big ICE raids on the enclaves of undocumented white people, such as the large Eastern European communities in various states? Have you seen the revocation of green cards for any of the white immigrants? Barron Trump meets the criteria, but I think he's safe.