First of all - Behold the awesome! LOST is back to melt our brains!
Brain melty 1:
1. LOSTIES don't crash because island is sunk.
2. Island is sunk because LOSTIES blowed up stuff in the past.
3. LOSTIES travelled to the past after crashing on the island.
4 .LOSTIES crashed because stuff wasn't blowed up in the past and island wasn't sunk.
So - how can the island be underwater in the same universe as non-crashing LOSTIES? If anyone says "wibbly wobbly timey wimey" they will be forever cursed and junk and stuff.
Bloody grandfather paradoxes....
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Whenever you mess with time travel, you get different, alternate timelines. At least that's how things appear to be in most sci-fi shows/movies (e.g., Star Trek 2009).
But that's not how we were told it worked in Lost. In Lost, the rule had been "whatever happened, happened". There's only one timeline. When someone tries to change history, they just end up fulfilling it. Simple, straightforward rule, that avoids the writers using time travel as a crutch.
Now they seem to be throwing out that rule, and the new rule is "Time travel works however we say it works at the moment, depending on what's most convenient for the story." I definitely feel like it's a cheat.