I believe outsourcing and letting different gifted devs take a crack at it could end in some actually nice Halo experiences. Halo Wars and sequel for instance have been made by different studios and turned out fairly nice.
May the builders behind Doom Everlasting make an incredible Halo sport? I do not know however I would like to see them get an opportunity to.
There may be a lot Halo lore you do not even want to fret about it being about Grasp Chief. Smaller tales set inside the Halo universe will be very fascinating.