Is no-one else taking issue with this?! That in the UK alone this would result in 2.3 million deaths, potentially 5 million hospitalised (versus circa 0.2 million beds...) and several million of seriously ill.
And you're acting as if that's ok?
And that's before you even start to consider that this may be a recurring virus (like the common cold) that people are only typically immune to for a matter of months (like the common cold).
3.5% worldwide, currently 2% in the UK.
But these figures are skewered. They say that 2% of those found to have tested positive for COVID-19 have died from it so far in the UK. 1372 have tested positive, 35 people have died, however 40,000 + people have been tested so of those tested the % of deaths is far lower.
We know how many people have died but have no truthful idea of how many have been infected as many symptoms are the same as the cold and flu as well as many people who just wouldn't bother to get tested or have themselves got sick and merely self-isolated. So there may well be 10k or 15k people actually infected with it but have no idea or have ridden out the stem assuming it to just be a cold.
This is why it's imperative not to panic. Figures can be misleading.
2.3 million deaths is on the assumption that 100% of the population contract the disease. But the math isn't quite as simple as that either.
Almost all of the deaths are in elderly people and/or with underlying health issues notably respiratory ones. The key to predicting the death rate more accurately is to understand how many of the aforementioned vulnerable people we have in the UK as of course that number isn't equal to those who aren't as vulnerable so a general percentage vs population count is unreliable.
But even with the idea of how many vulnerable people we have, it's impossible to predict how many of those are likely to contract the disease, and even more impossible to have an idea of how many will die from it.
Then of course the above is all based on death. There will be plenty more who won't die but will be in a seriously poor condition. So these figures don't even take into consideration the true effect on the NHS as many people will contract the disease, not die, but be incredibly sick.
As I said, bare complicated innit bro.