This may be unnecessary to some as it only just occurred to me!
In terms of the family and friends of the Oceanic 6 who greeted them as they returned from the island (besides Sayid who's died), how would they feel now knowing that they crashed again? In terms of news and media, surely they would have picked up that the Oceanic 6 were all on the one flight that crashed...AGAIN.
But the one that makes me think the most, will Widmore stage another crash? He staged the first one so that no-one would find the island, if he did so again, surely someone would catch on that the crashes were staged...
Just some thoughts that I thought I'd express, necessary or unnecessary.