The next spinoff after that will be The Nun, which, like The Crooked Man, is based off one of the dreadful monstrosities seen in The Conjuring 2.
All together, the Conjuring franchise has earned approximately $897 million worldwide, making it one of the most profitable horror franchises ever.
2014 saw the release of the prequel Annabelle, starring the doll from the first Conjuring movie, and its sequel, Annabelle: Creation, will be released this August.
While the fate of the main Conjuring series remains to be seen (a third film with Patrick Wilson and Vera Farmiga reprising Ed and Lorraine Warren, respectively, has been discussed), the franchise is still coasting along with its spinoffs.