Unless someone has some order or plan to go back and review all of the Green Cards from Iran, Iraq, Syria, etc....which could take a year or two with current manpower....I don’t see where this will go.
If the Green Card controllers did a crappy job, then I see no choice. But someone ought own up to this before we waste a ton of time on this.
I personally think they should have started with student visas, and cleared the deck with just that one crowd before starting on the remainders.
Last 4-5 terrorist attackers in USA were either Green Card holder or recent citizens.