I know this is tongue in cheek. But one of the hallmarks of a nation of immigrants is the enforced tolerance of speaking multiple national languages. Lots of people who only speak on throws off that balance.
What's this Swiss language you speak of? I never heard of it. You must mean Romansh but that's only 0.5% of the population or so. You'd have to kick out 95.5% of the Swiss population too then?