The Leader/Samuel Sterns from Hulk is going to be in the next Cap movie. Marvel doesn't seem to leave unresolved storylines even if it takes 15 years.
Ideally, they could've done that Crisis event spinning out The Flash to give a closure to the current DCEU. Gets Cavill and the others saving the multiverse as it was originally planned by the previous regime, and, with the multiverse being established, WBD can shift the focus on another universe with new actors playing these roles while the old ones are left in their own earths. Marvel will likely do that after Phase 12 or so, lol.