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What do we do if we find out this thing didn't come from a bat?

I think it is nearly certain it came from a bat one way or the other, possibly via a pangolin as a zoonotic pathway.

What do we do if there is no conferred immunity for this disease (either from contracting it or a vaccine)?

Or if it starts mutating rapidly to generate the same effect?

Hiding in our houses for the rest of our lives doesn't seem to be a viable option. Life has risks, this is simply another. Humans tend to adapt to their environments, this would be another thing that we would either adapt too or find a way to live with. Either way, spending the rest of our lives hiding under our beds does not appear to be a viable option.

If there is no immunity conferred, we will have to adjust obviously, and the elderly are going to suffer one way or the other particularly hard.  I'm very curious about how South Korea has managed this situation, there is more to it than testing of course.

We should be trying to learn from good and bad experiences elsewhere instead of harping on some single variable (particularly if it has a latent political point).

On testing ...

https://www.businessinsider.com/coronavirus-testing-per-capita-us-italy-south-korea-2020-4

One of the reason South Korea's tests/1M are lower than ours is that they started AGGRESSIVELY testing very early. Rather than let the virus spread unknowingly, whenever a positive case was found they would perform "contact tracing" to find out who you had been around in the recent past, and proactively go test THOSE people too, in order to try to arrest the spread before it could blow up. 

According to worldometers they have over 600K tests now and only a little over 10K documented cases, a 60:1 ratio.

We now have just under 6M tests and a little over 1M documented cases, only a 6:1 ratio. 

This is because we let this thing spread for a long time before anyone got serious about it, and even now we haven't followed South Korea's lead and attempted to do contact tracing and proactively look for where it might have spread when we find a confirmed case. 

One of the reason South Korea's tests/1M are lower than ours is that they started AGGRESSIVELY testing very early. Rather than let the virus spread unknowingly, whenever a positive case was found they would perform "contact tracing" to find out who you had been around in the recent past, and proactively go test THOSE people too, in order to try to arrest the spread before it could blow up.

According to worldometers they have over 600K tests now and only a little over 10K documented cases, a 60:1 ratio.

We now have just under 6M tests and a little over 1M documented cases, only a 6:1 ratio.

This is because we let this thing spread for a long time before anyone got serious about it, and even now we haven't followed South Korea's lead and attempted to do contact tracing and proactively look for where it might have spread when we find a confirmed case.

I don't remember the specifics of what it was or even where I read it, but one of the reasons that we don't follow the contact tracking model employed by the South Koreans is because Americans would not so freely allow such invasions into their privacy as the South Koreans demanded. Again, I don't remember where I read about this, but their contact tracing was pretty invasive. 

RoK had done 270,000 tests in mid-March, out of 52 million population.

There is this notion that South Korea tested aggressively, and early, which may be true, but they did not test even a large percentage of their population early.  There is more to their success than just early testing.

If they had tested only a quarter of a percent of the population by mid-March, that is not to me a sign of wide spread testing.  I'm sure they tested folks who showed symptoms and then did contact tracing to the extent possible, not just rep sample testing.

I am beginning to think we will have to have a treatment with an antiviral that works well, not a vaccine, and not herd immunity.