i think they could continue retail with cosmic lore, but azeroth lore in classic+.
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its not impossible to return to smaller stories once you go big. but it is very very difficult. fans often wont except it unless you do a full reboot, and often not even then. thats why experienced writers know to never go cosmic from the start. the mandalorian worked to some degree but its a different medium as well. im not sure a mandalorian film would work.