I think Sponsored Survival is proof a PvE mode is viable and setting the seasonal narrative around it would be a good idea.
Pretty much the title, It seems the narrative around the priority contracts got a little abandoned this season, I think the PvE mode proved a cooperative mode can be doable, maybe it would be a good way to set a narrative between the factions and characters without having to lock it behind the natural walls of the hardcore PvP modes, like the seasonal missions we had in destiny that were pretty popular in the more casual player base.
I know the more hardcore parts of the community think that the mode is breaking the economy, and it's true, but it's also true that more modes bring a bigger community, a bigger community means a thriving game, and it's not like the apex predators will stomp people less just because the average joe will get some prestige loot here and there.