Is there a really good reason why penalties cannot be reviewed? Did we just arbitrarily follow what the NFL does? To me it makes sense to be able to challenge penalties. The video review was set up to get more acurate officiating, with fewer screw-ups, like whether or not a ball is actually caught. But an incorrect penalty can potentially change the outcome of a game as well. I don't believe it would make the game any longer - we could have the same number of challenges, just expand the criteria. You wouldn't have a coach challenging every holding call, etc. But if there was a critical point in a game where a bogus interference call cost a team a touchdown, I think it should be challengable.
I think this would take a lot of pressure off Higgins too, as he wouldn't have to defend as many terrible calls the following week