Watching Olympic men's volleyball (USA v Canada) I noticed you get two requests for video play review but the request doesn't count if the decision was reversed in your favor.

In other words, you aren't penalized for requesting a review of a call that was clearly wrong. It's the officiators' way of saying, "OUR BAD."

I like that a lot because it holds the judges/refs/umps accountable.

But I'm not sure it would work in the NFL or other professional sports where participants frequently act in ways that are unsporstmanlike if there's a slim chance of benefit (like fouling your opponent repeatedly in the last two minutes of a basketball game).

Limiting play review to 2x means coaches act selectively on delaying the game. That's wise. So, I'm not sure unlimited (reversed) calls is the way to go.

Vladimir Mucibabic