Earlier quoted context omitted.
Switzerland has 8 million people that can work without nasty visas and their related problems. California has 321 million.
Read that again: "They can have anyone from the EU" (with no need for visas) That's 510 Million people - take 65Mi out when the UK leaves but that's still a bigger number (Google gives a total European population if you google that, but that's a wrong number)
Also WTF is a "residence permit". It sounds like a visa to me, and has similar requirements.