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Blue cards to be introduced into football for sin-bins under Ifab trials [The Guardian]
(www.theguardian.com)
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I think you're right, but I don't see it as a good thing
That's not supposed to matter - it's either a red card offence or it isn't, regardless of the time on the clock. The ref is not there to ensure the match is entertaining or balanced. He or she is there to make sure the rules are followed consistently.
It will give them more freedom, but IMO this will mean more inconsistency, as similar fouls are punished differently in the same game (for the reasons you suggest).