I still believe (as I stated in an earlier thread) that in the slightly long-term we will see far fewer reviews.
IMO, the standout result, so far, is that refs DO make mistakes and have no choice but to accept that players, coaches and even fans get it right some times when they, the PROFESSIONAL refs, 3 of them, watching nothing but the game, don't. And they (the refs) used to refuse the thought that THEY made mistakes. "No. That's what we do, what we are good at!"????
The more their calls ARE the right ones, the fewer reviews, and frustrations (at "bad" calls) we will all experience.
Remember too, the players coaches and even the fans may stop their (my) whinging at every call they (I) don't like.
Ah, Bliss! Oh yes, and the music is still too loud at some venues. It drowns out the TV commentary. Hey, that could be great for some!