they said half of the world population will get corona virus!

It is possible it would infect many people because it is highly transferable and even in places where a full lock down has been in effect there are still new cases reported ,although significantly lower . And it is similar in the flu as it is a virus,symptoms take days to present themselves meaning people could be infectious passing it on without knowing so. It is impossible to completely eradicate it . The majority of the population will build immunity against the virus. It is not nessecarily a bad thing as long as we have a vaccine and antivirals that offer a proper defense,until then.