So they want to kill end of game comebacks? Hilariously, the proposal, which is submitted out of concern for "player safety", has an exception for the last two minutes of a half. It's wildly stupid, but given the current substitution rules, in practice it would only be a very minor annoyance for all but the most extreme tempo teams. For example, Matt Hinton tweeted that Oregon took 20.4 seconds per snap this year. Freeze or someone said that even at max speed, they rarely get a play off in under 10 seconds. Of course, if the rules prohibits something that never happens, why have the rule?