Even in a situation where hospitals are getting overwhelmed it won't make much difference. Much of the care that happens is pointless. That 85 year old obese patient with chronic heart failure ain't making it no matter what you do. So if we are getting overwhelmed we can triage and not see much impact on fatality rates because patients like that are dying either way.
That’s in New York, and probably because they only put the really worst cases on ventilators because there weren’t enough ventilators. In Germany, that number of deaths on ventilators is at around 30%. This shows that this quota is entirely useless to make your argument, and that maybe you should curb your intuition a bit when it comes to estimating percentages of potentially saveable people, especially if those estimates are then used to effectively sentence people to certain death.
Here's the one from today (in English): https://www.rki.de/DE/Content/InfAZ/N/Neuartiges_Coronavirus...
The interesting table is on page 6, where there's the percentage of ventilated patients on ICU, which is 73%, so we know most ICU patients are ventilated, which means we can treat someone being on ICU as roughly equal to someone being ventilated. Right below is the number of discharges from ICU, and the percentage of deaths, which is 30% of all discharges. Since almost all ICU patients end up being ventilated, we can conclude that these about 30% of deaths mostly happened on ventilation, and most of the 70% recoveries also happened on ventilation.
I know that my calculation doesn't exactly result in the real percentage of deaths on ventilation, but the error range of my estimation does not allow the actual percentage of deaths on ventilation to even come close to 90%.
This is where your logic fails. Most patients in the ICU at this point in time are ventilated. That doesn't (necessarily) mean that most patients that went to the ICU were ventilated. Those that are ventilated will stay in the ICU for weeks. Those that aren't might only be there for a few days.
Some pepole in Italy were actually arguing for stronger limitations for 18-24 months until a vaccine was ready, and IIRC someone mentioned on HN a similar strategy (2 months closed - 1 months open) suggested for the UK.
So, there are people (in the authority chain) proposing for that. Whether they'll get listened to or not, it is another matter entirely. Personally I hope they don't.
And "flattening the curve" to buy time until we get a vaccine or a very successful treatment was literally in the comment I replied to. Not as in "we must lockdown until then", but as a goal we may reach if we continue with strict measures.
It's fine to want that, we just have to be aware that it might not happen (or might not happen soon) and that it isn't free.
"Flattening the curve" was, at least here, generally translated into "stay at home if possible, keep 2m distance in public, close non-essential stores and offices". And those aren't sustainable, and they come at a price.