you guys are crazy.
the show was NEVER about answering the island's mysteries.
The writers didn't not know their stuff. they knew everything, which is why it was all connected the way it did.
They didn't give us what they thought we wanted. They gave us a conclusion to THEIR story. THE story. The one about the characters. NOT about the island.
and if they all got off the island and lived happily ever after -that completely negates the entire point of the show.