Yoda Is Your Father said:

Speaking of this, not sure what I think of this island moving business. Hope they're not about to jump the shark.

I was expecting that to be a capability of the island since season 2, actually. Though my theory for the show was rather weird. I was guessing that the island exists in an alternate timeline of some sort to explain how weird the place was and to explain one of Ben's statements.

Now it seems to me that they have to travel down some sort of weird wormhole to reach the island. Relativistic effects and time going both forwards and backwards. That weird wheel Ben turned was connected to a pocket of antimatter (whatever that's supposed to imply) and its pretty clear now that the island's pocket of self-contained reality is based on magnetism in this world's version of physics.

Whether or not any of this will make a good ending for the show is something I can't judge. Though, I'd say that so far it's been a fun ride more often than not.