I read with interest the silly criticisms that say moving the marshals to the back will jeopardize pax safety because if something erupts in the front of the plane, the FAM needs immediate unfettered access. If there are pax or carts in the aisles, precious minutes will be lost.

For some reason, these folks don't point out that the same situation exists today. If something erupts in the rear of the plane (shoe bomber, underwear bomber), the FAM might have to get past pax and carts to address the situation.

They also neglect to mention that the 'back' of the plane could easily be the first row of economy.