Is that the one with the ridiculous head contact by Angus Blyth that was only a yellow in real time. [Just checked. No, it was the Brumbies]
The problem with the system is that some referees will use it as a cop-out and leave the TMO to make the decision. I'm also philosophically opposed to 20 minutes down. If it's worth a red card, it's worth a red card and being a man down for the rest of the game.
Don't want to get sent off and/or ruin the game as a spectacle? Don't commit acts of foul play.
Unfortunately Simon, WR has made a rod for their own back here. Red Cards have become a lottery, a fact that has never been more plainly demonstrated than by the ludicrous Freddie Steward RC.
What I would rather see in elite matches (i.e. those with a TMO) is NO red cards on the field. The referee can only issue a YC, which will get the player off the field and the game can carry on while the TMO has up to 10 minutes to view all the footage and decide one of three possibilities;
1. Yellow card confirmed. The player may return or be replaced after 10 minutes.
2. Red Card upgrade. The player cannot return, but may be replaced after 20 minutes.
3. Black Card upgrade. The player is off permanently can cannot be replaced.
I also think its time WR placed less emphasis on punishing the players immediately and allowing mitigation, and more emphasis on far longer, more severe punishments later. A player who commits a black card offence (that would be things such as eye gouging, bag snatching, kicking a player on the ground, punching another player in the head etc) and is subsequently found guilty, should be allowed no mitigation or account for a clean record or an early guilty plea, and be suspended for a calendar year - they miss the rest of the season and the first part of the following season.