This could work for dissent, but even then I'm not keen. A 10 minute spell on the sidelines is enough to ruin a game for something we're trying to define as less serious than a red card.

Imagine - a high stakes, UCL Semi Final, 88 minutes and it's level, end to end. A player loses it for a second under immense pressure, drops an f-bomb at the 4th official and is sin-binned. Their teammates stop playing and sit deep waiting for extra time. Game ruined, for what benefit?