@Pass:
To those who deny that TB will sink, think about this. Why else would Oda make the place a ship instead of an island?
It's like a chain of thoughts:
1st problem - He needs the island to be out of the Log Pose routes.
Solution - It's from West Blue.
2nd - How did it travel to the GL?
Oda-ish solution - IT'S A SHIP. WHOA.
Of course, it doesn't really prove you wrong, but it kinda answers the question. ^^
I too think TB is gonna sink actually. It'll symbol the defeat of Moria quite well, as well as freeing the Florian Triangle from the mysterious ghost island. I can't see how someone can be able to keep such a ship with such a past just continuing to float in the Triangle.