I’m firmly in the “whatever happened… happened” camp and I don’t think it’ll matter what Jack, Kate, Sawyer, Sayid and the Others do. If they change the past or future, that’ll be a huge paradox and the show will lose a lot of credibility for me. Plus there are a bunch of people that just arrived on the island in 2007 talking about stuff that "lies in the shadow of the statue" that I definitely think the writers must explore in season 6.
I have no proof (this is purely conjecture) but based on the WHH theory, I don't think detonating a bomb will make any difference to the Oceanic survivors past at all. It will probably be the cause of the Incident that leads them to build the Swan, that leads them to push the button every 108 minutes, that Desmond forgets to push, that causes Flight 815 to crash on the island.
I think Faraday was just trying to make sure everyone does what they need to do to keep history repeating itself.
What do you guys think? Whatever Happened Happened or that they actually can change the past and keep the plane from never crashing?