Our government-medical interactions are really complicated, but I think that it's possible to make a simple argument for nationwide insurance (or single payer) by looking at situations where the government picks up the tab for people who can't pay:
* Hospitals didn't before, don't now, and wouldn't in the future deny people critical procedures. For people who can't pay, these costs are going to be borne by society until we get so callous that we let people die in ERs.
* Noncritical procedures ("well, you have <insert problem here> and you can get by with as it is for the moment, but you'll eventually need expensive surgery") are the procedures that people without insurance opt not to (unless they become critical) get done
* Preventative care and doing noncritical procedures in a timely manner is a lot cheaper than dealing with the eventual catastrophe, particularly when you consider potential disability arising from catastrophe
The only way to rejigger the math so it makes sense to not have everyone insured is to assume a decreased treatment rate for people who don't have insurance. This could either come from an increased mortality rate or people just living with their noncritical disabilities. You don't have to pay for their critical procedures if they're dead or afraid to seek treatment. That isn't the kind of world I want to live in, but that's how it currently works (although quantifiably less-so than before Obamacare). The richest 1% lives more than a decade longer on average than the poorest 5%, and they do so without things like torn menisci.
Putting that aside, though, the CBO report on the previous iteration of AHCA has already been pretty unfavorable (the current one is likely worse) and doesn't even consider these "indirect" costs to society. The CBO report estimates that AHCA would eliminate 1.2 trillion dollars worth of healthcare and return 0.9 trillion dollars worth of rich people's taxes to them, for a net government savings of 323 billion dollars. How much would that savings be, though, if they did actually consider the critical care of the 24 million newly uninsured folk?
I'm not convinced that the current iteration of AHCA would even save the government money.
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