A bunch of us pilots were discussing bi-annual flight reviews and our experience over the few that we have had. We all felt they are always great refreshers, learning experiences and flushed out areas we had gotten lax in. The question on the table was what happens if you are real bad at the oral and flying skills especially being unsafe. Can the the CFI that performed the bi-annual suspend your flying privileges until you undergo training? Exactly what is the process the CFI can take to ensure you will not be a hazard to yourself and others?