I think the flipped classroom can be implemented particularly with older children.  This just takes proper planning and organization.  I spoke to a teacher about this concept earlier this week and he got so excited about the possibilities.  He is a teacher who favours the project approach and immediately could see how this approach would increase productivity in his classes.  The only drawback noted was the fact that since the students are reluctant to do homework now would they put in the effort to get the notes reviewed and the research done.