1) My faith is based solely on the creative teams involved. At this point, and at the point most of these originate, I see no reason to be optimistic. Having said that, I think this is a story that has immense relevance still and if properly done can be worthwhile.
2) There have been plenty of good remakes that have topped the original, and more recent ones that Dawn Of The Dead (which I will agree was excellent). I submit The Hills Have Eyes, Piranha, 3:10 To Yuma, The Crazies, and 13 Assassins for your consideration.