Bear case:
Brokers and clearing houses don't breaks ranks. The media doesn't care. The regulatory agencies don't care. Politicians don't care and keep yapping about the dangers of social media pumping. They are allowed counterfeit infinite stocks if they want for downward price pressure no matter how high the Failed To Deliver rate is. Buy side runs out of steam, and GME price collapses, longs capitulate and/or the company goes bankrupt.
Bull case:
If failed to deliver spikes, it might prompt a visibility problem that results in something being done about it, because the scam is indefensible. They (clearing houses, DTCC, SEC) were betting that it could be resolved before the deep crime got exposed. If this isn't the case and diamond apes hold, massive Failed To Deliver shows, Clearing houses and brokers may run for the door to be the first ones to not be owed a share by the shorting hedgies, getting out before the house of cards of GME share IOUs collapse. It's a potential prisoner's dilemma between them. Recalling shares borrowed and refusing to trade new shares with the short hedgies and brokers they use.