Not that it matters, they're in the Schengen area so no real border controls unless you're flying in and EU+EEA citizens minus Croatia can exercise their free movement rights without restrictions(so it won't even matter if they don't take refugees if another EU state does and gives them citizenship), and most of the EU policies still apply while giving up the "representation" EU citizens get in the EU parliament.
Not that it matters, they're in the Schengen area so no real border controls unless you're flying in and EU+EEA citizens minus Croatia can exercise their free movement rights without restrictions(so it won't even matter if they don't take refugees if another EU state does and gives them citizenship), and most of the EU policies still apply while giving up the "representation" EU citizens get in the EU parliament.