What happens if the big cex’s (Coinbase etc.) close down / move from the US?

I am from the US and have some Eth and BTC on exchange right now and I’m wondering what would happen if these cex’s move to Europe? Would that mean that I couldn’t cash out via exchanges anymore or would them moving just mean no more purchasing / trading via them? Just genuinely curious as I don’t want to sell any of my crypto for at least another year or two, so I’m wondering what the impact would be on US holders. Would you recommend pulling everything of cex’s for now? Thanks in advance for any responses!