I see it differently. They changed their economic strategy - they just adopted what I like to call Diet Reaganomics.
Left-leaning neoliberal bureaucrats within the Democratic Party are like unicorns. They certainly aren't the driving force. How many years has Baucus been pushing income tax reform without any traction in his own party?
Furthermore, they didn't adopt a Republican policy for ACA. Insurance is inherently socialistic, and the way the policy externalizes costs and the amount of cost the policy externalizes determines the nature of the insurance program. Saying that ACA and 1990s Republican healthcare are the same concept is like saying the Cruze is the same as a Silverado because they both have a bowtie badge on the front.