I remember his quote being that the ACA was a good start, but didn't go far enough, and "autocratic leadership" was needed to break resistant high cost structures.
Being familiar with Christensen's work & background, I didn't interpret that to mean we should move to single payer, but rather he was echoing many who thought the ACA was too narrowly focused on insurance coverage, and didn't address other systemic issues. My assumption was he was referring to fairly radical private moves on the provider side, like what Intermountain is doing in Utah, or what Amazon is looking at, Walmart, etc.
If we ever get back to seriously discussing policy as a nation, what are the credible conservative ideas on how to improve healthcare, while keeping coverage of pre-existing conditions, etc? My impression is Republicans are thankful to not have to talk about healthcare.