I dont know what you guys are watching, but players go after loose balls anyway already , it is usually after the fact that we find out that a whistle had been blown.
My biggest concern is that it will make zebras even more indecisive. They can get the mentality of just blowing the whistle, probably in the home teams favor, and if they're wrong replay will fix it.
Officiating was too much of a factor in the playoffs and especially the SuperBowl.
Something will have to change eventually cause replay is only making officiating worse.