Some plays might take a couple looks from several angles, so 15 seconds to make a determination might be “too quick.” But surely, in 20 seconds (my limit), if not 15 seconds (your limit), after the flag’s throwing has been noted, it should be possible to decide whether to continue on with the next play, or “hold” for further review.
I’m guessing the referees would insist on doing their own over-ruling @ the game, but “New York” could call for the review, or point out finer points of rules if a ref is in error on such. I’m guessing a fair amount of “back and forth” already occurs once those headphones are put on.
I'll take my chances, bad calls usually cancel out over time, anyway. But the length of games is ridiculous. I basically only watch the fourth quarter now, if I even watch a game, because what's the point of spending three hours watching, when the game comes down to the last five minutes, anyway?
One issue is like last year, where for the Superbowl they change the definition of a catch in NY, but don’t tell anyone.