It may impact Swiss nationals in other countries as well. One of my Swiss colleagues is pretty worried about what this means for his Danish job. My understanding is that it's possible he could be deported, though that probably won't happen. The freedom-to-reside treaty is reciprocal: Danish nationals can work and live in Switzerland under equal conditions that Swiss nationals can work and live in Denmark. Now it appears that Switzerland has abrogated parts of its treaty obligations, and is imposing new restrictions on Danish nationals living in Switzerland. It's not clear what this means for the treaty rights of Swiss nationals living in Denmark. They may no longer have any treaty rights if Switzerland is deemed to have withdrawn from the treaty. Though Denmark might voluntarily choose to grandfather in existing residents, or give them an easy path to apply for a new visa (probably the business community will strongly push for this).