Lets say they're successfull, then what?

If this thought has been posted I haven't seen it but would like a few answers or even ideas. Im sure i cannot make this sound smooth but here it goes. Jack and the rest of the 70s 316 members do blow up the swan can they really go off the island? there idea is so that they will never land on the island, righ? but in order for them to land in LA-X the swan station cannot be built. so im missing something right? if they blow away the swan then they will never crash but in order for the swan to never be fully built then they would have to still crash right? Because no crash(815) would mean that they couldn't go back in time to blow it up. So the Swan would still be there. In all honesty i think we will find a whole other reason behind the crash of 815

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