+4
The herd immunity hypothesis is not a given that it will take place and protect the overall population. The coronavirus is so new that its behavior in the population can't be predicted accurately. There's no hard evidence that someone who has recovered from coronavirus has immunity from future re-infections. Though it's possible that they could develop some form of immunity. On the other hand it's also possible coronavirus could, like some flu strains, mutant each season and so be able to reinfect people.
With highly contagious viruses like measles, 90% of the population needs to have immunity to prevent big outbreaks. With social distancing and shelter in place programs, people will be less likely to come in contact with coronavirus, meaning there will be a large percentage of the population who will still be at risk for catching coronavirus in the future.
Once a vaccine has been found it will take 18 months for testing before being available to the general population. Then the manufactures have to ramp up production and get 100's of millions of people vacationed, before the coronavirus can be stopped. Two years of this pandemic is possible and that's if they can find a vaccine quickly, otherwise it could be longer.
I'm not trying to be dismal about this, but I am trying to be realistic. All over the internet and media I see people trying to grapple with this frighting pandemic and I see a lot of myths popping up like warm weather will kill the virus off...It's best to be informed, take precautions and find solace in what ever type of inner strength or faith one has...and keep your fingers crossed too.