Before they convert every team to grass they should require an installation of an under the field water powered heating system to maintain grass/field temperatures at all outdoor stadiums. This would drastically reduce injury during the winter time when the grass is normally as hard as cement, would increase the on-field temperature, and would also reduce heavy snow from being as high of an impact as it would melt. On top of this it would ensure the field conditions across the league were nearly identical regardless of it being indoor/outdoor.