Nothing can be return back to normal until 7 billion units of vaccines get manufactured,this is insane number and don't know how long it will take to produce such amount,but atleast a year is needed to inject medicine to the everyone in this world then only people can be set free from the fear of getting affected.
Many people are already infected with a coronavirus, and has its own immune system. Others are not afraid to get infected. At first, you need much less vaccines than 7 billion. We're not dealing with a plague.
I agree while 7 billion vaccines will be the optimal number we need to be realistic, that is simply not possible at least for the short term, so governments will have to decide which is the best and most effective way to make use of whatever vaccines they can get their hands on, and to me it is obvious that those that are at a greater risk of suffering long lasting effects or even death are the ones that should be vaccinated first, so the elderly and those with previous health issues should be vaccinated first.
I think that from a few hundred million vaccines to a billion will be enough to start with. This way we can vaccinate those who are at risk. We will also significantly reduce the burden on medical institutions.
I would very much like to see vaccines being produced as soon as possible.