And they have the best writers that money can buy. I don't think so. With the exception of scientific labs which are already scheduled for 90 minutes, there are very few examples of teaching techniques that are not already effectively used in the traditional 50 minute classroom. Below is a list of dynamic teaching techniques that are used in education. Teachers, by in large, function as independent contractors who do the best they can because of their inner-motivations.
Administrators are merely interested in avoiding problems.
There just simply isn't time in their schedule to observe, train, re-tool, motivate or inspire teachers. This is an ugly reality. Research and development are not line items for American public schools. To assume that 90 minute restructuring will gain better lesson plans is both naive and foolish. With the exception of complex scientific labs, all teaching techniques can be used effectively in both 50 minute and 90 minute classrooms.