I don't think the rule changes that are being proposed now are primarily meant to help the AI. With longer health bars battles will last longer, but it'll become easier to save your units by retreating them in time. Will the AI learn to retreat its unit at the right moment? Big questionmark here. Maybe they will, it doesn't seem unprogrammable, but I've gotta see it first.
Embarked units being able to defend themselves will be good for the AI, but the current system is silly anyway. Embarked units are becoming defenseless and can't even be stacked with military vessels. The AI is going completely wrong with this, but also as a human player I'm not pleased. If I'm getting a military unit from an island CS I can't get it safely to my lands. Building 6 frigates and having them form an escort would be the only safe way, but that would be bonkers. No, that change is very welcome, for both the AI and the human player.