Although
@DarkWitch the main theory I have is that Kizaru is going to hold back the sky laser.
In fact's it's already happened before:
Enies Lobby has the same hole as Lulusia Kingdom
but part of the island survived.
And Enies Lobby is always bright:
The idea is that an light logia, possibly awakened, died to partially block/hold off the laser, hence why the area is alway bright in addition to having the hole.