It might not happen the way we think it would. There are an unlimited amout of ways it could start. They might not really be dead, it could be a brain disease, or something like the from the 28 movies but they eat you not throw-up on you. So i guess the question is not will it happen, but which way will it happen.
Because if t he world is coming to a end. It better be some sort of flesh eating being. Because i dont want no bombs. no giant astroids, or ice ages.... I want to kill me some zombies-Oh and go looting:P
Ah, but that's how they get you... With their triumphs in modern fried food, you just come in for a burger, but wait, you can get a big mac for almost the same price... and then you can upgrade that big mac to have extra large fries and shake for just a dollar more... and then before you know it youre hooked to Mc Donalds.... Snack attacks will be the doom of us!! DOOOOOM!
You should prepare for anything, a general bug-out type scenario. You need like 5 or 6 different plans. Natural disasters, monstrous incursions (including reanimates), foreign invasion, civil unrest, or martial law.
who's to say whether or not it will actually happen. I've read several reports of supposed zombie activity but they were just words that could've been typed up by someone who was bored and had an over active imagination. Whatever happens in the future....I'm sure we'll be ready and willing to deal with it.