Well, the subsidy just buys us some time to stabilize the risk pool. Meanwhile, the ACO+Factory model is emerging, which flips the incentives; changes the way the product is consumed, so we stop overpaying in the first place.
It's incredibly frustrating because this is a solved problem - even just fixing the most egregious flaws in the ACA would be a huge improvement. I am very skeptical, though, that in my lifetime American voters will ever be unified enough again to take on the de facto doctors union, the health insurer oligopoly, and the pharmaceutical companies, all of whom currently benefit from the broken system, and basically control the government top to bottom.