To get an idea of how the future would possibly be like were zombies to take over, watch World War Z online. The film begins with an outbreak of zombies being reported in major cities of the world. The situation is deteriorating fast because any human being who gets bitten by a zombie turns into a zombie in a matter of seconds.
Following an outbreak in Philadelphia, Gerry, who formerly worked for the United Nations as an investigator, and his family are able to flee and find refuge in the house of a family friend in Newark. Owing to his close relationship with a high ranking UN official, Gerry and his family are evacuated the next day. The family friends however decline to go with Gerry. As a consequence they are attacked by zombies. Only their son fails to get infected and Gerry and his family treat him as their own.
The next destination after the evacuation is aboard a navy carrier where Gerry gets to learn more about the outbreak.
When Gerry travels to Jerusalem where the zombie outbreak had been anticipated a week earlier, zombies attack by managing to climb over the massive walls. And as Gerry fights them together with the Israeli Defense Forces, he realizes that the zombies are passing over the wounded, the infirm and the elderly. Gerry is now convinced that the only way to save the uninfected from the zombie outbreak is to infect everyone with a curable disease as a way of masking themselves from the zombies. Watch World War Z and find out the risk and the consequences of this approach.