I'm not exactly sure what you mean by this.
The US does spend a lot more, and doesn't cover everyone. If I understood the parent post, (part of what) it's saying that the US needs to focus on lowering costs, because otherwise, the fact that there is so much spending even now, is going to cause trouble. And more trouble than comparable countries, because the price in the US is so much higher.
I'm not sure if you're disagreeing with this, or what? Do you assume that if the US covered everyone, it would be cheaper? Would be great if you could clarify :)