While it has its merits, I think that a full video replay system is only going to be yet another stressor placed on event organizers, referees and FIRST.
Initially I was thinking: Why not just change the current rule? Often, teams go to the question box with a complaint about the way a foul was called or match was scored, and they try to argue their case without video evidence. If teams that go to the question box could simply provide the replay of the exact moment of the missed call, would it be too unreasonable for the refs to use that as evidence to overturn a call?
But this only introduces the potential for more delays. The Alamo Regional was a full 2 hours behind schedule, and lord knows how much more time would be lost scrutinizing every detail of a match just played.
One other (smaller) factor: video replay of every match would mean that scores would be delayed 2-3 minutes after a match. I can't see that being well-received by the audience
