The zombies might be able to return to the island, but why?
Pegs' observation that the zombies who had actually made it to shore were mostly "dying" (if that is even possible for a zombie), most likely from starvation and the exhaustion/exposure of a 26 mile swim (which I also didn't know zombies could do). I doubt they would want to chase a handful of dinner all they way back where they came from when there is plenty of food there on the mainland.
And personally, I'd rather take my chances against a few 'really tired' zombies occasionally popping out of the surf on an island beach than struggle against a nation-load of
smart ones,
big ones, painted ones, jumping ones, whatever...
AND the mallers. And, as we have seen so far, concrete forts and steel towers don't appear to hold up very well against these enemies. They may want to look for a new way to deal with their bad neighbor problem. Move away. Far away.
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