Small Groups don't work?

saw this quote somewhere today:

"Small groups are things that trick us into believing we’re serious about making disciples. The problem is 90 percent of small groups never produce one single disciple. Ever. They help Christians make shallow friendships, for sure. They’re great at helping Christians feel a tenuous connection to their local church, and they do a bang-up job of teaching Christians how to act like other Christians in the Evangelical Christian subculture. But when it comes to creating the kind of holistic disciples Jesus envisioned, the jury’s decision came back a long time ago—small groups just aren’t working.”