The EB-4 special immigrant category for non-ministers has been subject to a periodic sunset since the category was created in 1990.  The current category is due to expire on September 30, 2019. USCIS must receive I-360 petitions and I-485 by that date or they will be rejected.  I-360 petitions pending for non-ministers after that date will be held in abeyance until Congress further extends the category.
Another threat to the EB-4 category is country-specific visa limitations and over-subscriptions.  It is very important to check the current month’s Visa Bulletin to make sure that the I-360 priority date is within any visa availability cut-off date.  Currently there are backlogs in the category for religious workers from El Salvador, Honduras, and Guatemala, and Mexico.