See, we are entering potential paradox territory here.
If they make it so the bomb goes off, stops the 'incident' and therefore they don't crash on the island, they won't be on the island in order to trigger the events that result in them going back in time and setting off the bomb. They'd be stuck in one big time loop, without someone there to set off the bomb the plane will crash, they'll then set off the bomb, reset time, but then there's no one there to set off the bomb to reset time so the plane will crash again...
ARGGGGH MY BRAIN!
I'm hoping the Lost writers are clever enough to either explain a way around said paradox or (ideally imo) make it so that the bomb going off did in fact trigger the event and it was all supposed to happen. Either that or the uranium in the bomb being thrown into the pocket somehow triggered the event and the bomb never actually went off. The flash of light could be another time shift as whatever they were sent back in time to do (trigger the event) was done and thus they were returned to their original place in time possibly? I dunno, i just hope they don't do the whole 'and it never happened' ending as it's just too cheap and lazy imo.
If they make it so the bomb goes off, stops the 'incident' and therefore they don't crash on the island, they won't be on the island in order to trigger the events that result in them going back in time and setting off the bomb. They'd be stuck in one big time loop, without someone there to set off the bomb the plane will crash, they'll then set off the bomb, reset time, but then there's no one there to set off the bomb to reset time so the plane will crash again...
ARGGGGH MY BRAIN!
I'm hoping the Lost writers are clever enough to either explain a way around said paradox or (ideally imo) make it so that the bomb going off did in fact trigger the event and it was all supposed to happen. Either that or the uranium in the bomb being thrown into the pocket somehow triggered the event and the bomb never actually went off. The flash of light could be another time shift as whatever they were sent back in time to do (trigger the event) was done and thus they were returned to their original place in time possibly? I dunno, i just hope they don't do the whole 'and it never happened' ending as it's just too cheap and lazy imo.