Buildings can be constructed, beds and associated equipment and I did mean beds as in hospital beds with associated equipment (ICU or otherwise) - where are you going to educated and train doctors and nurses to manage 3X.
Also, a common argument would be 3X is for such black swan events. What will happen to those beds, hospitals and manpower in a normal situation, especially with costs associated with educating and training medical professionals.
Don't get me wrong, I'm onboard with the fact that something fundamentally needs to change all over the world.
>where are you going to educated and train doctors and nurses to manage 3X
I suggest introducing a medical equivalent of military reserve forces/organized militias. These would be volunteers who train several times a year with medical professionals, to be called up in emergencies. Training would be limited to the skills most important in a pandemic. To incentivize volunteering, they could be given priority for medical treatment when resources are limited.
Even so, if those volunteers who are going to be performing dangerous and invasive (but potentially life-saving) procedures (like intubating people) and making snap life-or-death decisions (that require aptitude + years of medical education + experience, to avoid inadvertently killing their patients), we're going to need to have a very different set of expectations about these emergency volunteer medics/nurses than we would have for professional medics/nurses. With respect to death rates, expertise, errors, negligence, professional standards, how they will respond psychologically to the work. They would probably be better than nothing, but I imagine that an average person would rather have professional treating them than a volunteer, so that would be something that we would have to work through as a society.