In each of the past several years, the reported number of actual confirmed influenza deaths in the US has ranged from around 3500 to 15,620. The CDC later massages these numbers to get statistical estimates, and figures around six times as many people die of flu (including pneumonia deaths) as are actually confirmed. (See this discussion.) You are familiar with the estimates, including up to 80,000 in the last really bad outbreak.
In the last three months (really, mostly a month and a half), the actual confirmed COVID-19 deaths in the US have numbered over 80,000; at some later point, the CDC will massage this number to get a statistical estimate that includes people who were never tested. Based on some preliminary numbers of excess deaths in New York, the real total of Americans who have died in the current pandemic may already exceed two hundred thousand, and the year is young.
For the flu, we already have some alternatives to shelter-in-place, notably the annual flu shots and the fact that many people already have some level of immunity to various strains of the flu because they’ve been exposed to it before. NEITHER of those alternatives are available for this virus, yet.
If you suffer long-lasting health complications from a bout of this disease, you are probably not going to survive financially anyway, and financial survival means nothing at all if you die.
At this point, we have no idea whether these people really have long-lasting immunity, so no, we don’t know that the metrics have changed all that much. With the original SARS virus, for example, antibody levels decline quite rapidly after two or three years; we don’t know what that means for their immunity. With some of the other coronaviruses that cause common cold symptoms, immunity may be measured in weeks or months. With the virus causing COVID-19, immunity may be permanent, or at least long enough for vaccines to be available, or these same people who have already been infected may be vulnerable all over again by the fall. We don’t know.
This sounds like a wish or a hope rather than any sort of established fact.
Those people getting the new treatment protocols, however, are still taking up bed space and equipment in the hospitals, and if they take up too much space for too long, then we’re right back at overwhelmed health care systems and plummeting survival rates. It’s not enough to improve treatment: we still have to keep the number of people infected and requiring treatment at a manageable number.