UN warns 2021 will be worst "humanitarian crisis" in decades

Getting the vaccine out to all 8 billion of the world's population will be a logistic nightmare. Just think of how difficult it was to get COVID-19 tests and masks during the beginning of the pandemic. Vaccines will be a lot harder, considering transportation and storage requirements, and the fact that two doses are needed a month apart from the same company.

Well, you don't need everyone to be vaccinated, although it helps. Think of how your country eradicated COVID-19 without it. Social distancing, mask wearing, good hygiene + vaccine will all help herd immunity kick in faster and bring the virus number down to 0.

I agree with what you are saying, but as Trump's packed rallies in the Deep South have proven, there will always be a significant number of people who will refuse to make those efforts. Herd immunity is going to be even more challenging to achieve for as long as these people continue to maintain unhygienic habits. It wouldn't be so bad if it was simply a small minority of people as herd immunity would still occur regardless. However, in this instance, we're talking of hundreds of thousands of people who refuse to wear masks and keep a safe distance. Even people who do follow some hygienic practices are still a risk of spreading the virus. For instance, not everyone sneezes into their elbow rather than into their hands, and I still quite often see people who stand around in large groups when I am out and about.

Australia has been able to handle it better than many other countries around the world, but that could also be contributed to our low population density and the fact that we don't share any land borders. The virus can still be spread even while social distancing, mask wearing etc. are in place. New Zealand went 100+ days without a single case of community transmission until four cases were detected from an unknown source. Also, in a country as populated as the United States, those hygienic practices aren't going to completely eradicate COVID-19 when you have all those far-right, anti-vaxers who live right across the country. The situation is even worse in developing countries. COVID-19 is most likely never going to be eradicated in many of those countries. There's millions of impoverished families who live in slums in Kenya who don't have access to clean water or proper sewage. Wet markets are still operating in mainland China, Thailand etc. Those environments are breeding grounds for both COVID-19 and potential new viruses.