From what I understood "resistance" is not black and white - Drosten said on his podcast that most likely a second infection would be mild, like one of the known Coronaviruses, as your immune system knows what it's up against.
When I say resistance I mean a "you don't get sick again", we know that "normal" corona viruses don't give us a lasting immunity and cause what we call the common cold (rhinovirus is another common pathogen for that), which while uncomfortable isn't going to put you in the ICU.
So there is a chance that a vaccine isn't going to be possible, nor would a life time immunity. What might happen is that this becomes an endemic virus that does become more mild over time (like say the flu we have now vs the one in 1918). Or it might disappear completely like SARS/MERS did.
The one piece of good news when it comes to viruses in general is that even though they mutate rather quickly they tend to trend towards mildness not deadliness, main reason is that a virus that kills it's host has a lower chance to reproduce and infect others.
What could possibly go wrong? - FWIW, the two mass testing sites in heavily impacted Philly metro area are closing, with hopes that hospital labs will be able to possibly fill the void - but with them testing hundreds of people a day still....that's probably unlikely.
One can't help but wonder...is this a way to artificially lower the diagnosis count so that it can thus "bend the curve" faster in hopes of a premature
"re-opening of the country?"
I actually had this discussion with someone on Facebook. The main reason to have a lot of testing and testing sites is to identify and contain the spread, however we are and have been way past that. Right now all the stay at home orders and social distancing guidelines are really aimed at one thing and one thing only - keep the numbers of acute patients low enough for hospitals to be able to handle the influx.
Secondary reason for testing is statistics, the more infected you identify the better idea you have of the speed and severity of infection. Those things are pretty important to know but the problem is that the more people you test the higher the strain on your labs. Additionally you can still have an idea of rates of infection from testing only people who are sick enough to go to hospitals.
For example in my wife's hospital they had to change ER protocols to only request lab work if it is absolutely needed* because the lab is already overloaded with C19 testing.
*normally labs would be ordered to confirm a diagnosis but diagnosis can often be made without the labs
Finally current CDC testing guidelines are to test only if it changes medical management**, which doesn't really require mobile testing sites as anyone well enough to go to one likely doesn't need medical intervention
**For example if you have a mild fever, cough and fatigue but nothing else, there isn't anything that a doctor can do for you. OTOH if you have pneumonia it's important to know if it's viral or bacterial.