Is This the Most Astonishing Obamacare Result Ever?

...the very instant that penalties begin for high readmission rates, everything stabilizes again. Apparently America's hospitals unanimously decided that once they'd hit a certain level, that was good enough and they wouldn't bother trying to improve even more...
http://www.motherjones.com/kevin-drum/2016/03/most-astonishing-obamacare-result-ever