The article is interesting but really lacks details. For example, Sprint has leases in place with the tower companies (generally on a portfolio basis) and simply cannot walk away from those leases cost-free. In addition, even assuming that they could reduce their operating costs by moving from privately-owned towers to public facilities, it would cost money to move the equipment. Maybe they can execute the plan, but you have to be at least a little concerned about the ability execute a plan of this scale.