Greg Sargent has his political blinders on claiming in the Washington Post that "the most important Obamacare metric of all" is "how many people are gaining hea[l]th care coverage". This is not the most important metric. The most important metric, and real data won't come in for quite some time on this, is whether the ACA health payment regime is sustainable and can maintain our first class medical system, avoiding system collapse.
The most important thing in the health care reform debate is not insurance. It is the delivery of actual care. When you change reimbursements, certain business models stop being profitable. We have no idea how that will play out in marginally sustainable practices and hospitals across the country.