The purpose of blowing up the hydrogen bond is so that losties never crash on the island. However, nobody knows what the effects will be when the bomb is deonated. I think that all the losties will die.
As Richard says to Locke he has seen all the losties in 1977 die. Richard may say this because Locke, Sun and Ben are on the island thirty years after the hyrdrogen bomb has been detonated. Therefore, they will have to go back to 1977 and warn the losties to not detonate the bomb because it has changed things on the island which we will find out about when Locke visits Jacob in the season finale.
This is also hinted when Richard says he needs to speak to Locke before he goes to see Jacob. Locke, Ben and Sun have just returned to the island and assume it is the same as they left it. But we could be seeing the island as a result of the bomb being detonated.
Also as previously pointed out "the incident" could have been the detonation of the bomb. Which may be linked to the destruction of the statue, and whatever, as a result of the detonation, lies in the "shadow of the statue" could be the reason that Locke, Ben and Sun need to go back and stop the bomb being detonated.
Peace Out Al
As Richard says to Locke he has seen all the losties in 1977 die. Richard may say this because Locke, Sun and Ben are on the island thirty years after the hyrdrogen bomb has been detonated. Therefore, they will have to go back to 1977 and warn the losties to not detonate the bomb because it has changed things on the island which we will find out about when Locke visits Jacob in the season finale.
This is also hinted when Richard says he needs to speak to Locke before he goes to see Jacob. Locke, Ben and Sun have just returned to the island and assume it is the same as they left it. But we could be seeing the island as a result of the bomb being detonated.
Also as previously pointed out "the incident" could have been the detonation of the bomb. Which may be linked to the destruction of the statue, and whatever, as a result of the detonation, lies in the "shadow of the statue" could be the reason that Locke, Ben and Sun need to go back and stop the bomb being detonated.
Peace Out Al