When I hear "adjourn" at the end of General Conference, it seems rather formal. When I think of what it means, break off (a meeting, legal case, or game) with the intention of resuming it later", it reminds me of the last word of Jacob, adieu.
Jacob seems to be saying, "farewell until we meet with God". President Eyring is not saying "Fare well, I may never see you again". He is saying goodbye, or "God be with you until we meet again".