This look like my game now, except i dont have end game crisis active and i play on VH/VH. Vlad is at war with 3 factions. At some point the AI just stop trying and it makes it unfun. 

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Its not just the AI not attacking and being too passive. Its also too easy because of various things including but not limited to high economy mid to late game, the way corruption is easily acquired and gotten rid of (needs to be toned down per battle and per character), growth is very high even dwarfs are at tier 5 by turn 60 or 70 if done right, public order takes care of itself enough for you to just move on and keep conquering instead of using resources to pacify and hold back rebellions, exp and money gained through battles.

 Just so many compounding things that makes for a much easier experience. Sliders and optional caps could be implemented to make a challenging gameplay experience.

I have noticed that the AI is very passive in normal difficultly. It is not

 the case in Warhammer 2 .