They don't. We send pensions to them. Also, EHIC has been agreed upon outside shit like the WA. Which is a charge-back service to the respective state healthcare systems. I run up a bill in Germany in a hospital stay, then they send the bill to the NHS.On the flip side, you won't be able to dump your trash(elderly) on the rest of Europe since presumably the EU isn't going to jump at supporting old people from outside of the block. You are also going to pay more for basic services since you won't get cheap eastern labor anymore.