The officiating will be better if replay is gone, because they won't have this crutch to rely on.
I don't know about that - there are many MANY plays during the course of the game they are conferring on, and you KNOW someone from above is trying to take a quick look at it and let them know what the call should be.
I'd be willing to bet they get 98%+ of the calls correct - you'll never get it to 100%, not a chance.