firstly the "bad people coming to rescue them" probably isn't quite true.
Ben has gone and told jack that Niomi isn't part of a search mission or who they believe her to be but in fact someone from the "hostiles" that the others or at least ben know about. So its obvious he is probably right because through all the programs Ben has usually hinted ot given clues about what will happen for him to be bang on.
Secondly although we find out that the jack flashbacks are actually the future I think it would be great if what is put on that blog actually happens and we start watching in series four the future events with the flashbacks revealing what happened on the island after series three....that would be really really cool.