in the postseason? I know committed purists would cringe, but since it seems calculated to lead to quicker scores, it might be fitting for the NCAA Tournament, as it would reduce the prospect of a team playing multiple OTs one night and then having to play again within 24 hours or so.

I guess in order to advance to the Cup you should "earn" the right - if that means 3 OT's in a game so be it. But I think it works great in an 82-game regular season, especially when each team will have a fair number of "back to backs". That rationale would favor doing something like it in the FF. Maybe 5 minutes of 5 on 5, then go to 3 on 3 till somebody scores.

than it would in the NCAA tournament.

there are no back to backs in the Cup playoffs. There obviously are in the regionals of the FF. Nobody should have to play an opponent the next night after, say, a double OT. The odds are pretty strong that by 10 minutes of 3 on 3 you'll have a goal.

If they play three OTs, it affects both teams.