Honestly they should just make a conversion of Planetside 2 at this point. Forget about asymmetric balance, we have a way to make balanced teams. Instead of Marines and Xenos just use Imperial Guard, Renegade Guard and Genestealer Cults. That way you can both reuse assets and also have 3 fairly different armies. Renegades could still get Marines, but Chaos Marines would basically be MAX Suits. They could also get Daemons to add more flavor. Lesser Daemons could be standard infantry if they wanted to make them more prevalent. Imperial Guard could get Assassins for their Elites, or maybe Deathwatch as that would justify having a ton of individual Marines from different chapters wandering around. Genestealer Cults could of course just get higher level Tyrannids for their bug bois. It'd be so much simpler to make, easier to justify in the lore and still allow for a wide range of additions. I think part of what doomed this game was faction choice. It's cool they tried to do playable Xenos, but clearly they were too small of a studio trying to do too much. Not to mention it'd have all but solved the Loyalist Fanboy ideas about how they should be able to 1 v 10 their opponents as a standard Marine. If they're basically playing as limited MAX loadouts then that's fine for the most part.