If they are only available after all eligible elites and everyone else on the battlefield list has been accommodated then no big deal (and probably very little revenue as there aren't too many flights with F demand that are going out with empties, I'd guess). If they are selling upgrades rather than seating elites then things could get ugly in a hurry.
Then again, if the policy really is supposed to go into effect starting tomorrow I'd think that the rumors would have started earlier. After all, there are a LOT of GAs to train on the system and someone would have spilled the beans earlier than this.