It really is the perfect time for them to form SWORD, in-universe. Shield has been gone for a long time, and SWORD can fill in the gap a bit, while also acting as a valid recognition of the fact that the MCU is not at all like our world anymore and they can't pretend it is supposed to be.
MCU Earth has been invaded by aliens 4 times that everyone in the world knows about, not even counting smaller shit like Thor 1 or the Skrulls. New York, London, Thanos: Rumble in the Jungle and Thanos 2: Revengeance.
After shit like the snap, and with the Avengers as an organization defunct, its clearly time for someone to step up and say "Hey, maybe we need an X-COM now?"