I wonder how many people will see this and try to smuggle in fertile cats. Probably a non-zero amount, though I suspect nobody will volunteer to move there to take care of them.
I suppose it's possible to smuggle fertile cats in, but it's really far-fetched. According to another comment here, this remote island has a single ferry. A howling cat in a carrier is going to be easily noticed while boarding the ferry or traveling on it.
I said try not succeed, though it wouldn't be that hard to sedate a cat for thirty minutes or find a boat.
I think some people will think this is a travesty they can fix. Even this thread has some amount of people who don't seem to realize this is intentional and the alternatives aren't great.
The cat island only existed because fishermen were there to feed them with their catches.
The fishermen are gone and the last humans on the island are aging out.